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**Weekly assignment for 10-15 through 10-19**

Mon: p146: 8-13, 14-17 Tue: p146: 18-29 Wed: p152: 15-27 Thur:p153:28-38 Fri: p159: quiz ch 3.1 through 3.3

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**Lesson 3-1 Representing Relations Lesson 3-2 Representing Functions **

Lesson 3-3 Linear Functions Lesson 3-4 Arithmetic Sequences Lesson 3-5 Proportional and Nonproportional Relationships Chapter Menu

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**Five-Minute Check (over Chapter 2) Main Ideas and Vocabulary **

California Standards Example 1: Represent a Relation Example 2: Real-World Example Key Concept: Inverse of a Relation Example 3: Inverse Relation Lesson 3-1 Menu

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warm up 15, october 18, 2012 (over Chapter 2) Translate three times a number decreased by eight is negative thirteen, into an equation. A. 3(8 – n) = –13 B. 3n – 8 = –13 C. 3(n – 8) = –13 D. 3 × 8 – n = –13 A B C D 5 Min 1-1

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**Solve –24 + b = –13. A. b = 11 B. b = –37 C. b = –11 D. b = 37 A B C D**

(over Chapter 2) Solve –24 + b = –13. A. b = 11 B. b = –37 C. b = –11 D. b = 37 A B C D 5 Min 1-2

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(over Chapter 2) Solve for b. A B C D 5 Min 1-3

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(over Chapter 2) A stamp collector bought a rare stamp for $16, and sold it a year later for $ Find the percent of change. Round to the nearest whole percent. A. 22 percent decrease B. 28 percent decrease C. 22 percent increase D. 28 percent increase A B C D 5 Min 1-4

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(over Chapter 2) One train traveling at 60 miles per hour and another at 80 miles per hour leave the same location going in opposite directions. In how many hours will these trains be 420 miles apart? A B C D A. 3 hours B. 4 hours C. 6 hours D. 7 hours 5 Min 1-5

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**Lesson 3-1 Ideas/Vocabulary**

Notes 15, october 18, 2012 Represent relations as sets of ordered pairs, tables, mappings, and graphs. Find the inverse of a relation. mapping inverse Lesson 3-1 Ideas/Vocabulary

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**Preparation for Standard 16**

Preparation for Standard Students understand the concepts of a relation and a function, determine whether a given relation defines a function, and give pertinent information about given relations and functions. Standard Students determine the domain of independent variables and the range of dependent variables defined by a graph, a set of ordered pairs, or a symbolic expression. Lesson 3-1 CA

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Represent a Relation A. Express the relation {(4, 3), (–2, –1), (–3, 2), (2, –4), (0, –4)} as a table, a graph, and a mapping. Table List the x-coordinates in the first column and the corresponding y-coordinates in the second column. Animation: Relation Lesson 3-1 Example 1a

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**Graph Graph each ordered pair on a coordinate plane.**

Represent a Relation Graph Graph each ordered pair on a coordinate plane. Lesson 3-1 Example 1a

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Represent a Relation Mapping List the x-values in set X and the y-values in set Y. Draw an arrow from the x-value to the corresponding y-value. Lesson 3-1 Example 1a

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Represent a Relation B. Determine the domain and range for the relation {(4, 3), (–2, –1), (–3, 2), (2, –4), (0, –4)}. Answer: The domain for this relation is {–3, –2, 0, 2, 4}. The range is {–4, –1, 2, 3}. Lesson 3-1 Example 1b

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**A. Express the relation {(3, –2), (4, 6), (5, 2), (–1, 3)} as a mapping.**

B C D A. C. B. D. CYP 1-1

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**B. Determine the domain and range of the relation {(3, –2), (4, 6), (5, 2), (–1, 3)}.**

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**Determine the domain and range of the relation.**

Use a Relation A. OPINION POLLS The table shows the percent of students satisfied with their grades at the time of the survey. Determine the domain and range of the relation. Answer: The domain is {1996, 1999, 2002, 2005}. The range is {21, 32, 51, 60}. Lesson 3-1 Example 2a

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**Use a Relation B. Graph the data.**

The values of the x-axis need to go from 1996 to It is not practical to begin the scale at 0. Begin at 1996 and extend to 2005 to include all of the data. The units can be 1 unit per grid square. The values on the y-axis need to go from 21 to 60. In this case it is possible to begin the scale at 0. Begin at 0 and extend to 70. You can use units of 10. Lesson 3-1 Example 2b

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**C. What conclusions might you make from the graph of the data?**

Use a Relation C. What conclusions might you make from the graph of the data? Answer: Satisfaction increased from 1996 to 2002, but decreased from 2002 to 2005. Lesson 3-1 Example 2c

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ENDANGERED SPECIES The table shows the approximate world population of the Indian Rhinoceros from 1986 to Determine the domain and range for the data provided in the table. D = {1000, 1700, 1900, 2100, 2400}; R = {1986, 1990, 1994, 1998, 2005} D = {5}; R = {4} D = {1986, 1990, 1994, 1998, 2005}; R = {1000, 1700, 1900, 2100, 2400} D = {2005}; R = {2400}

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B. Graph the data. A B C D A. C. B. D. CYP 2-2

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**C. What conclusions might you make from the graph of the data?**

The population of the Indian rhinoceros has been decreasing since 1986. The population of the Indian rhinoceros has been increasing since 1986. The population of the Indian rhinoceros has stayed the same since 1986. The Indian rhinoceros has become extinct.

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Lesson 3-1 Key Concept 1

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Inverse Relation Express the relation shown in the mapping as a set of ordered pairs. Then write the inverse of the relation. Relation: Notice that both 7 and 0 in the domain are paired with 2 in the range. Answer: {(5, 1), (7, 2), (4, –9), (0, 2)} Inverse: Exchange X and Y in each ordered pair to write the inverse relation. Answer: {(1, 5), (2, 7), (–9, 4), (2, 0)} Lesson 3-1 Example 3

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**Express the relation shown in the mapping as a set of ordered pairs**

Express the relation shown in the mapping as a set of ordered pairs. Then write the inverse of the relation. A. Relation {(2, 3), (1, –4), (2, 5)} Inverse {(3, 2), (–4, 1), (5, 2)} B. Relation {(3, 2), (–4, 1), (5, 2)} Inverse {(–3, –2), (4, –1), (–5, –2)} C. Relation {(3, 2), (–4, 1), (5, 2)} Inverse {(2, 3), (1, –4), (2, 5)} D. Relation {(3, 2), (–4, 1), (5, 2)}

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End of Lesson 3-1

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**Five-Minute Check (over Lesson 3-1) Main Ideas and Vocabulary **

California Standards Key Concept: Functions Example 1: Identify Functions Example 2: Equations as Functions Example 3: Function Values Example 4: Nonlinear Function Values Example 5: Standards Example Lesson 3-2 Menu

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warm up Number 16 (over Lesson 3-1) Which option expresses the relation {(–1, 0), (2, –4), (–3, 1), (4, –3)} as a table and graph? A B C D A. B. C. D. 5 Min 2-1

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**Write the inverse of the relation {(5, –2), (0, 3), (2, 1), (–4, 3)}.**

(over Lesson 3-1) Write the inverse of the relation {(5, –2), (0, 3), (2, 1), (–4, 3)}. A B C D A. {(–2, 5), (0, 3), (1, 2), (3, –4)} B. {(–2, 5), (3, 0), (1, 2), (–4, 3)} C. {(–2, 5), (3, 0), (2, 1), (–4, 3)} D. {(–2, 5), (3, 0), (1, 2), (3, –4)} 5 Min 2-2

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(over Lesson 3-1) Jason, a waiter, expressed his customers’ bills and the tips they left him as the relation {(10, 2), (8, 1.5), (4, 1.25)}. Which of the following options expresses the relation as a table? A B C D A. C. B. D. 5 Min 2-3

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(over Lesson 3-1) Determine the domain (D) and the range (R) for the relation {(3, –1), (2, 3), (4, 0), (–1, –2)}. A B C D A. D = {–1, 2, 3, 4} R = {–2, –1, 3} B. D = {–1, 2, 3, 4} R = {–2, –1, 0, 3} C. D = {–2, –1, 0, 3} R = {–1, 2, 3, 4} D. D = {–1, 2, 3} R = {–2, –1, 3} 5 Min 2-4

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**Lesson 3-2 Ideas/Vocabulary**

Notes 16, Determine whether a relation is a function. Find functional values. function vertical line test function notation function value Lesson 3-2 Ideas/Vocabulary

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Standard Students understand the concepts of a relation and a function, determine whether a given relation defines a function, and give pertinent information about given relations and functions. Standard Students determine whether a relation defined by a graph, a set of ordered pairs, or a symbolic expression is a function and justify the conclusion. Lesson 3-2 CA

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Lesson 3-2 Key Concepts 1

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**A. Determine whether the relation is a function. Explain.**

Identify Functions A. Determine whether the relation is a function. Explain. Answer: This is a function because the mapping shows each element of the domain paired with exactly one member of the range. Lesson 3-2 Example 1a

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**Animation: Is This a Function?**

Identify Functions B. Determine whether the relation is a function. Explain. Answer: This table represents a function because the table shows each element of the domain paired with exactly one element of the range. Animation: Is This a Function? Lesson 3-2 Example 1b

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**A. Is this relation a function? Explain.**

Yes; for each element of the domain, there is only one corresponding element in the range. Yes; because it can be represented by a mapping. No; because it has negative x-values. No; because both –2 and 2 are in the range.

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**B. Is this relation a function? Explain.**

No; because the element 3 in the domain is paired with both 2 and –1 in the range. No; because there are negative values in the range. Yes; because it is a line when graphed. Yes; because it can be represented in a chart.

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**Equations as Functions**

Determine whether x = –2 is a function. Graph the equation. Since the graph is in the form Ax + By = C, the graph of the equation will be a line. Place your pencil at the left of the graph to represent a vertical line. Slowly move the pencil to the right across the graph. At x = –2 this vertical line passes through more than one point on the graph. Answer: The graph does not pass the vertical line test. Thus, the line does not represent a function. Lesson 3-2 Example 2

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**Determine whether 3x + 2y = 12 is a function.**

yes no not enough information

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**Function Values A. If f(x) = 3x – 4, find f(4).**

f(4) = 3(4) – 4 Replace x with 4. = 12 – 4 Multiply. = 8 Subtract. Answer: f(4) = 8 Lesson 3-2 Example 3a

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**f(–5) = 3(–5) – 4 Replace x with –5. = –15 – 4 Multiply. **

Function Values B. If f(x) = 3x – 4, find f(–5). f(–5) = 3(–5) – 4 Replace x with –5. = –15 – 4 Multiply. = –19 Subtract. Answer: f(–5) = –19 Lesson 3-2 Example 3b

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**A. If f(x) = 2x + 5, find f(3). A A. 8 B B. 7 C C. 6 D D. 11**

Lesson 3-2 Example 3CYP-A

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**B. If f(x) = 2x + 5, find f(–8). A. –3 B. –11 C. 21 D. –16 A B C D**

Lesson 3-2 Example 3CYP-B

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**Nonlinear Function Values**

PHYSICS The function h(t) = 160t + 16t2 represents the height of an object ejected downward from an airplane at a rate of 160 feet per second. A. Find the value h(3). h(3) = 160(3) + 16(3)2 Replace t with 3. = Multiply. = 624 Simplify. Answer: h(3) = 624 Lesson 3-2 Example 4

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**Nonlinear Function Values**

PHYSICS The function h(t) = 160t + 16t2 represents the height of an object ejected downward from an airplane at a rate of 160 feet per second. B. Find the value h(2z). h(2z) = 160(2z) + 16(2z)2 Replace t with 2z. = 320z + 64z2 Multiply. Answer: h(2z) = 320z + 64z2 Lesson 3-2 Example 4

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The function h(t) = 180 – 16t2 represents the height of a ball thrown from a cliff that is 180 feet above the ground. A. Find the value h(2). 164 ft 116 ft 180 ft 16 ft

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The function h(t) = 180 – 16t2 represents the height of a ball thrown from a cliff that is 180 feet above the ground. B. Find the value h(3z). 180 – 16z2 ft 180 ft 36 ft 180 – 144z2 ft

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**A. For every $2 dollars donated, Mike’s Car Rental donates $7. **

The algebraic form of a function is m = 5d, where d is the number of dollars customers of Mike’s Car Rental donate to a charity and m is the donation made by Mike’s Car Rental. Which of the following represents the same function? A. For every $2 dollars donated, Mike’s Car Rental donates $7. B. f(d) = 5m C. D. Lesson 3-2 Example 5

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**Choices B and C represent the function , which is incorrect.**

Read the Item The independent variable is d and the dependent variable is m. Solve the Item Choice A represents the function m = 3.5d. This is incorrect because it should be m = 5d. Choices B and C represent the function , which is incorrect. In Choice D, the graph represents the function m = 5d, which is correct. The answer is D. Lesson 3-2 Example 5

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**B. For every two hours the pool is rented, the cost to the PTA is $10.**

The algebraic form of a function is c = 5h, where h is the number of hours a pool is rented and c is the cost to the PTA. Which of the following represents the same function? A B C D A. f(h) = 5c B. For every two hours the pool is rented, the cost to the PTA is $10. C. f(h) = 2c D. For every two hours the pool is rented, the cost to the PTA is $5. Lesson 3-2 CYP 5

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End of Lesson 3-2

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Notes 17, october 19

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**Five-Minute Check (over Lesson 3-2) Main Ideas and Vocabulary **

California Standards Key Concept: Standard Form of a Linear Equation Example 1: Identify Linear Equations Example 2: Real-World Example Example 3: Real-World Example Example 4: Graph by Making a Table Example 5: Graph by Using Intercepts Lesson 3-3 Menu

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**Determine whether the relation shown in the mapping is a function.**

warm up 17 (over Lesson 3-2) October 19, 2012 Determine whether the relation shown in the mapping is a function. yes no 5 Min 3-1

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**Determine whether the relation shown in the table is a function.**

(over Lesson 3-2) Determine whether the relation shown in the table is a function. yes no 5 Min 3-2

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(over Lesson 3-2) Determine whether the relation {(7, 0), (0, 7), (–7, 0), (0, –7)} is a function. yes no 5 Min 3-3

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**Determine whether the relation y = 6 is a function.**

(over Lesson 3-2) Determine whether the relation y = 6 is a function. yes no 5 Min 3-4

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**If g(x) = –2x – 2, find g(–2x). A. g(–2x) = –4x – 2 A**

(over Lesson 3-2) If g(x) = –2x – 2, find g(–2x). A. g(–2x) = –4x – 2 B. g(–2x) = –2x – 2 C. g(–2x) = 2x – 2 D. g(–2x) = 4x – 2 A B C D 5 Min 3-5

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(over Lesson 3-2) A. 25 B. 29 C. 31 D. 32 A B C D 5 Min 3-6

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**Lesson 3-3 Ideas/Vocabulary**

Notes 17, october Identify linear equations, intercepts, and zeros. Graph linear equations. linear equation standard form x-intercept y-intercept zero Lesson 3-3 Ideas/Vocabulary

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Standard 6.0 Students graph a linear equation and compute the x- and y-intercepts (e.g., graph 2x + 6y = 4). They are also able to sketch the region defined by linear inequality (e.g., they sketch the region defined by 2x + 6y < 4). (Key, CAHSEE) Standard 7.0 Students verify that a point lies on a line, given an equation of the line. Students are able to derive linear equations by using the point-slope formula. (Key, CAHSEE) Lesson 3-3 CA

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Lesson 3-3 Key Concept 1

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**Identify Linear Equations**

A. Determine whether 5x + 3y = z + 2 is a linear equation. If so, write the equation in standard form. First rewrite the equation so that the variables are on the same side of the equation. 5x + 3y = z + 2 Original equation 5x + 3y – z = z + 2 – z Subtract z from each side. 5x + 3y – z = 2 Simplify. Since 5x + 3y – z has three different variables, it cannot be written in the form Ax + By = C. Answer: This is not a linear equation. Lesson 3-3 Example 1a

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**Identify Linear Equations**

B. Determine whether is a linear equation. If so, write the equation in standard form. Rewrite the equation so that both variables are on the same side of the equation. Original equation Subtract y from each side. Simplify. Lesson 3-3 Example 1b

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**Identify Linear Equations**

To write the equation with integer coefficients, multiply each term by 4. Original equation Multiply each side of the equation by 4. 3x – 4y = 32 Simplify. The equation is now in standard form where A = 3, B = –4, and C = 32. Answer: This is a linear equation. Lesson 3-3 Example 1b

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**A. Determine whether y = 4x – 5 is a linear equation**

A. Determine whether y = 4x – 5 is a linear equation. If so, write the equation in standard form. linear equation; y = 4x – 5 not a linear equation linear equation; 4x – y = 5 linear equation; 4x + y = 5

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**B. Determine whether 8y –xy = 7 is a linear equation**

B. Determine whether 8y –xy = 7 is a linear equation. If so, write the equation in standard form. not a linear equation linear equation; 8y – xy = 7 linear equation; 8y = 7 + xy linear equation; 8y – 7 = xy

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**A. Determine the x-intercept, y-intercept, and zero.**

WATER STORAGE A valve on a tank is opened and the water is drained, as shown in the graph. A. Determine the x-intercept, y-intercept, and zero. Answer: x-intercept = 4; y-intercept = 200; zero of the function = 4 Lesson 3-3 Example 2a

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**B. Describe what the intercepts mean.**

WATER STORAGE A valve on a tank is opened and the water is drained, as shown in the graph. B. Describe what the intercepts mean. Answer: The x-intercept 4 means that after 4 minutes, there are 0 gallons of water left in the tank. The y-intercept of 200 means that at time 0, or before any water was drained, there were 200 gallons of water in the tank. Lesson 3-3 Example 2b

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**BANKING Janine has money in a checking account**

BANKING Janine has money in a checking account. She begins withdrawing a constant amount of money each month as shown in the graph. A. Determine the x-intercept, y-intercept, and zero. 10; 250; 10 10; 10; 250 250; 10; 250 5; 10; 5

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**B. In relation to the previous problem, describe what the x-intercept of 10 means?**

It is the amount of money before anything was withdrawn. That after 10 months, there is no money left in the account. It is the amount of money in the account after 6 months. This cannot be determined.

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ANALYZE TABLES A box of peanuts is poured into bags a the rate of 4 ounces per second. The table shows the function relating to the weight of the peanuts in the box and the time in seconds the peanuts have been pouring out of the box. A. Determine the x-intercept, y-intercept, and zero of the graph of the function. Answer: x-intercept = 500; y-intercept = 2000; zero of the function = 500 Lesson 3-3 Example 3a

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**Interactive Lab: Graphing Relations and Functions**

B. Describe what the intercepts in the previous problem mean. Answer: The x-intercept 500 means that after 500 seconds, there are 0 ounces of peanuts left in the box. The y-intercept of 2000 means that at time 0, or before any peanuts were poured, there were 2000 ounces of peanuts in the box. Interactive Lab: Graphing Relations and Functions Lesson 3-3 Example 3a

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**ANALYZE TABLES Jules has a food card for Disney World**

ANALYZE TABLES Jules has a food card for Disney World. The table shows the function relating the amount of money on the card and the number of times he has stopped to purchase food. A. Determine the x-intercept, y-intercept, and zero. 5; 125; 5 5; 5; 125 125; 5; 125 5; 10; 15

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**B. In relation to the previous problem, describe what the y-intercept of 125 means?**

It represents the time when there is no money left on the card. It represents the original value of the card. At time 0, or before any food stops, there was $125 on the card. This cannot be determined.

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**Graph by Making a Table Graph y = 2x + 2.**

Select values from the domain and make a table. Then graph the ordered pairs. The domain is all real numbers, so there are infinite solutions. Draw a line through the points. Answer: Lesson 3-3 Example 4

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**Is this graph the correct graph for y = 3x – 4?**

yes no not enough information to determine

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**Graph by Using Intercepts**

Graph 4x – y = 4 using the x-intercept and the y-intercept. To find the x-intercept, let y = 0. 4x – y = 4 Original equation 4x – 0 = 4 Replace y with 0. 4x = 4 Divide each side by 4. x = 1 To find the y-intercept, let x = 0. 4x – y = 4 Original equation 4(0) – y = 4 Replace x with 0. –y = 4 Divide each side by –1. y = –4 Lesson 3-3 Example 5

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**Animation: Graph Linear Equations**

Graph Using Intercepts Graph 4x – y = 4 using the x-intercept and y-intercept. Answer: The x-intercept is 1, so the graph intersects the x-axis at (1, 0). The y-intercept is –4, so the graph intersects the y-axis at (0, –4). Plot these points. Then draw a line that connects them. Animation: Graph Linear Equations Lesson 3-3 Example 5

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**Is this graph the correct graph for 2x + 5y = 10?**

yes no not enough information to determine

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End of Lesson 3-3

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**Five-Minute Check (over Lesson 3-3) Main Ideas and Vocabulary **

California Standards Key Concept: Arithmetic Sequence Example 1: Identify Arithmetic Sequences Key Concept: Writing Arithmetic Sequences Example 2: Real-World Example Key Concept: nth Term of an Arithmetic Sequence Example 3: Real-World Example Lesson 3-4 Menu

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(over Lesson 3-3) Is 2x + y = –9 a linear equation? If so, write the equation in standard form. A. no B. yes; 2x = 9 + y C. yes; 2x + y = –9 D. yes; y = –2x –9 A B C D 5 Min 4-1

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(over Lesson 3-3) Is 3x – xy + 7 = 0 a linear equation? If so, write the equation in standard form. A. no B. yes; 3x – xy = –7 C. yes; D. yes; 3x – xy + 7 = 0 A B C D 5 Min 4-2

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**Is a linear equation? If so, write the equation in standard form.**

(over Lesson 3-3) Is a linear equation? If so, write the equation in standard form. A. no B. yes; 2x – y = 10 C. yes; 2x = 10 – y D. yes; y = 2x – 10 A B C D 5 Min 4-3

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(over Lesson 3-3) Graph y = –3x + 3. A B C D A. C. B. D. 5 Min 4-4

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(over Lesson 3-3) Jake’s Window Service uses the equation c = 5w to calculate the total charge c based on the number of windows w that are washed. What will be the charge for washing 15 windows? $90.25 $90.00 $80.25 $75.00 5 Min 4-5

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**Which of the following is not a linear equation?**

(over Lesson 3-2) Which of the following is not a linear equation? A. y = 5 B. xy = 1 C. D. y = 1 – x A B C D 5 Min 4-6

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**Lesson 3-4 Ideas/Vocabulary**

Recognize arithmetic sequences. Extend and write formulas for arithmetic sequences. sequence terms arithmetic sequence common difference Lesson 3-4 Ideas/Vocabulary

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**Reinforcement of Standard 7AF3**

Reinforcement of Standard 7AF3.4 Plot the values of quantities whose ratios are always the same (e.g., cost to the number of an item, feet to inches, circumference to diameter of a circle). Fit a line to the plot and understand that the slope of the line equals the quantities. (Key, CAHSEE) Lesson 3-4 CA

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Lesson 3-4 Key Concepts 1

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**Identify Arithmetic Sequences**

A. Determine whether –15, –13, –11, –9, ... is an arithmetic sequence. Explain. Answer: This is an arithmetic sequence because the difference between terms is constant. Lesson 3-4 Example 1a

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**Identify Arithmetic Sequences**

B. Determine whether is an arithmetic sequence. Explain. Answer: This is not an arithmetic sequence because the difference between terms is not constant. Lesson 3-4 Example 1b

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**A. Determine whether 2, 4, 8, 10, 12, … is an arithmetic sequence.**

cannot be determined This is not an arithmetic sequence because the difference between terms is not constant. This is an arithmetic sequence because the difference between terms is constant.

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**B. Determine whether … is an arithmetic sequence.**

cannot be determined This is not an arithmetic sequence because the difference between terms is not constant. This is an arithmetic sequence because the difference between terms is constant. CYP 3-4-1

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Lesson 3-4 Key Concept 2

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**Find the common difference by subtracting successive terms.**

TEMPERATURE The arithmetic sequence –8, –11, –14, –17, … represents the daily low temperature in ºF. Find the next three terms. Find the common difference by subtracting successive terms. The common difference is –3. Lesson 3-4 Example 2

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**Answer: The next three terms are –20, –23, –26.**

Subtract 3 from the last term of the sequence to get the next term in the sequence. Continue subtracting 3 until the next three terms are found. Answer: The next three terms are –20, –23, –26. Lesson 3-4 Example 2

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TEMPERATURE The arithmetic sequence 58, 63, 68, 73, … represents the daily high temperature in ºF. Find the next three terms. A. 78, 83, 88 B. 76, 79, 82 C. 73, 78, 83 D. 83, 88, 93 A B C D Lesson 3-4 Example 2CYP

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Lesson 3-4 Key Concept 3

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**A. Write an equation for the nth term of the sequence.**

MONEY The arithmetic sequence 1, 10, 19, 28, … represents the total number of dollars Erin has in her account after her weekly allowance is added. A. Write an equation for the nth term of the sequence. In this sequence, the first term, a1, is 1. Find the common difference. The common difference is +9. Lesson 3-4 Example 3a

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**Use the formula for the nth term to write an equation.**

an = a1 + (n –1)d Formula for the nth term an = 1 + (n –1)(9) a1 = 1, d = 9 an = 1 + 9n – 9 Distributive Property an = 9n – 8 Simplify. Lesson 3-4 Example 3a

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**Check: For n = 1, 9(1) – 8 = 1. For n = 2, 9(2) – 8 = 10.**

For n = 3, 9(3) – 8 = 19, and so on. Answer: an = 9n – 8 Lesson 3-4 Example 3a

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**B. Find the 12th term in the sequence.**

Replace n with 12 in the equation written in part A. an = 9n – 8 Equation for the nth term a12 = 9(12) – 8 Replace n with 12. a12 = 100 Simplify. Answer: 100 Lesson 3-4 Example 3b

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**C. Graph the first five terms of the sequence.**

Answer: The points fall on a line. The graph of an arithmetic sequence is linear. Lesson 3-4 Example 3c

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MONEY The arithmetic sequence 2, 7, 12, 17, 22, … represents the total number of pencils Claire has in her collection after she goes to her school store each week. A. Write an equation for the nth term of the sequence. an = 2n + 7 an = 5n + 2 an = 2n + 5 an = 5n – 3

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MONEY The arithmetic sequence 2, 7, 12, 17, 22, … represents the total number of pencils Claire has in her collection after she goes to her school store each week. B. Find the 12th term in the sequence. 12 57 52 62

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MONEY The arithmetic sequence 2, 7, 12, 17, 22, … represents the total number of pencils Claire has in her collection after she goes to her school store each week. C. Does this graph show the first five terms of the sequence? yes no cannot determine

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End of Lesson 3-4

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**Five-Minute Check (over Lesson 3-4) Main Ideas and Vocabulary **

California Standards Example 1: Proportional Relationships Example 2: Nonproportional Relationships Lesson 3-5 Menu

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(over Lesson 3-4) Determine whether the sequence –21, –17, –12, –6, 1, … is an arithmetic sequence. If it is, state the common difference. A. yes; 4 B. yes; 5 C. yes; 6 D. no A B C D 5 Min 5-1

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(over Lesson 3-4) Determine whether the sequence 1.1, 2.2, 3.3, 4.4, … is an arithmetic sequence. If it is, state the common difference. A. yes; 0.1 B. yes; 1 C. yes; 1.1 D. no A B C D 5 Min 5-2

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(over Lesson 3-4) Find the next three terms of the arithmetic sequence 3.5, 2, 0.5, –1.0, … . A. –2.5, –4.0, –5.5 B. –2.5, –4.0, –4.5 C. –2.5, –3.0, –3.5 D. –1.5, –2.0, –2.5 A B C D 5 Min 5-3

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**Find the nth term of the sequence described by a1 = –2, d = 4, n = 7.**

(over Lesson 3-4) Find the nth term of the sequence described by a1 = –2, d = 4, n = 7. A. 28 B. 26 C. 24 D. 22 A B C D 5 Min 5-4

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**Write an equation for the nth term of the sequence 19, 17, 15, 13, … .**

(over Lesson 3-4) Write an equation for the nth term of the sequence 19, 17, 15, 13, … . A. an = 2n + 21 B. an = 2n + 19 C. an = –2n + 21 D. an = 2n + –19 A B C D 5 Min 5-5

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(over Lesson 3-4) A sequence is formed by writing the perimeter of squares. The side of the first square measures 1 unit. If the measure of the side of the square is increased by 1 unit for each new term in the sequence, what is the common difference between the terms? 16 4 2 1 5 Min 5-6

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**Lesson 3-5 Ideas/Vocabulary**

Write an equation for a proportional relationship. Write an equation for a nonproportional relationship. inductive reasoning Lesson 3-5 Ideas/Vocabulary

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Standard Students understand the concepts of a relation and a function, determine whether a given relation defines a function, and give pertinent information about given relations and functions. Lesson 3-5 CA

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**Proportional Relationships**

A. ENERGY The table shows the number of miles driven for each hour of driving. Graph the data. What conclusion can you make about the relationship between the number of hours driving h and the numbers of miles driven m? Answer: The graph shows a linear relationship between the number of hours driving and the number of miles driven. Lesson 3-5 Example 1a

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**Proportional Relationships**

B. Write an equation to describe this relationship. Look at the relationship between the domain and the range to find a pattern that can be described as an equation. Lesson 3-5 Example 1b

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**Proportional Relationships**

Since this is a linear relationship, the ratio of the range values to the domain values is constant. The difference of the values for h is 1, and the difference of the values for m is 50. This suggests that m = 50h. Check to see if this equation is correct by substituting values of h into the equation. Lesson 3-5 Example 1b

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**Proportional Relationships**

Check If h = 1, then m = 50(1) or 50. If h = 2, then m = 50(2) or 100. If h = 3, then m = 50(3) or 150. If h = 4, then m = 50(4) or 200. The equation checks. Answer: f(h) = 50h Since this relation is also a function, we can write the equation as f(h) = 50h, where f(h) represents the number of miles driven. Lesson 3-5 Example 1b

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**A. Graph the data in the table**

A. Graph the data in the table. What conclusion can you make about the relationship between the number of miles walked and the time spent walking? There is a linear relationship between the number of miles walked and time spent walking. There is a nonlinear relationship between the number of miles walked and time spent walking. There is not enough information on the table to determine a relationship. There is an inverse relationship between miles walked and time spent walking.

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**B. Write an equation to describe the relationship between hours and miles walked.**

A. m = 3h B. m = 2h C. m = 1.5h D. m = 1h A B C D Lesson 3-5 Example 1CYP-B

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**Nonproportional Relationships**

Write an equation in function notation for the relation graphed below. Make a table of ordered pairs for several points on the graph. Lesson 3-5 Example 2

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**Nonproportional Relationships**

The difference in the x values is 1, and the difference in the y values is 3. The difference in y values is three times the difference of the x values. This suggests that y = 3x. Check this equation. Check If x = 1, then y = 3(1) or 3. But the y value for x = 1 is 1. This is a difference of –2. Try some other values in the domain to see if the same difference occurs. y is always 2 less than 3x. Lesson 3-5 Example 2

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**Nonproportional Relationships**

This pattern suggests that 2 should be subtracted from one side of the equation in order to correctly describe the relation. Check y = 3x – 2. If x = 2, then y = 3(2) – 2 or 4. If x = 3, then y = 3(3) – 2 or 7. Answer: y = 3x – 2 correctly describes this relation. Since the relation is also a function, we can write the equation in function notation as f(x) = 3x – 2. Lesson 3-5 Example 2

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**Write an equation in function notation for the relation that is graphed.**

A. f(x) = x + 2 B. f(x) = 2x C. f(x) = 2x + 2 D. f(x) = 2x + 1 A B C D Lesson 3-5 Example 2CYP

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End of Lesson 3-5

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**Image Bank Math Tools Animation Menu Graphing Relations and Functions**

Resources Menu

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**3-3 Graph Linear Equations**

3-1 Relation 3-2 Is This a Function? 3-3 Graph Linear Equations CIM Menu

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**1. Exit this presentation. **

To use the images that are on the following three slides in your own presentation: 1. Exit this presentation. 2. Open a chapter presentation using a full installation of Microsoft® PowerPoint® in editing mode and scroll to the Image Bank slides. 3. Select an image, copy it, and paste it into your presentation. Image Bank 1

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Image Bank 2

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Image Bank 3

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Image Bank 4

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**This slide is intentionally blank.**

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