Splash Screen. 1.A 2.B 3.C 4.D Five Minute Check 4 (over Chapter 2) Find –6 – (–12). A.18 B. 12 C. 6 D. –6 Find –5(11). A.–55 B. –16 C. 16 D.55 The temperature.

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Splash Screen

1.A 2.B 3.C 4.D Five Minute Check 4 (over Chapter 2) Find –6 – (–12). A.18 B. 12 C. 6 D. –6 Find –5(11). A.–55 B. –16 C. 16 D.55 The temperature at 2:00 P.M. was 58ºF. By 9:00 P.M. the temperature was 44ºF. What is the average change in the temperature per hour? A.–14ºF B. –7ºF C. –2ºF D. –1ºF

1.A 2.B 3.C 4.D Five Minute Check 4 (over Chapter 2) Find –6 – (–12). A.18 B.12 C.6 D.–6

1.A 2.B 3.C 4.D Five Minute Check 5 (over Chapter 2) Find –5(11). A.–55 B.–16 C.16 D.55

1.A 2.B 3.C 4.D Five Minute Check 6 (over Chapter 2) A.–14ºF B.–7ºF C.–2ºF D.–1ºF The temperature at 2:00 P.M. was 58ºF. By 9:00 P.M. the temperature was 44ºF. What is the average change in the temperature per hour?

Lesson Menu Main Idea Example 4:Real-World Example Example 5:Test Example

Main Idea/Vocabulary Write verbal phrases and sentences as simple algebraic expressions and equations (2.8.8C) (M7.D.2.1). AddSubtractMultiplyDivide AddedDifferenceMultipliedQuotient PlusminusProductDivided by Sumtimesseparate

Example 4 FOOD An average American adult drinks more soft drinks than any other beverage each year. Three times the number of gallons of soft drinks plus 27 is equal to the total 183 gallons of beverages consumed. Write an equation that models this situation.

Example 4 Answer: The equation is 3s + 27 = 183. WordsThree times the number of gallons of soft drink plus 27 equals 183. VariableLet s = the number of gallons of soft drinks. Equation3s + 27 = 183

1.A 2.B 3.C 4.D Example 4 A.8 – 2t = 26 B.2t – 8 = 26 C.2t – 26 = 8 D.26 – 2t = 8 EXERCISE It is estimated that American adults spend an average of 8 hours per month exercising. This is 26 hours less than twice the number of hours spent watching television each month. Write an equation that models this situation.

Example 5 Which problem situation matches the equation 4.9y = 17.3? AAfter giving away 4.9 kg of tomatoes, Harry had 17.3 kg left. What is y, the number of kg of tomatoes that Harry began with? BThe total length of two toy cars is 17.3 cm. One car is 4.9 cm long. What is y, the length of the other car? CA chemist separated a solution into 4 equal quantities of 17.3 mL. What is y, the amount of solution she began with? DRodrigo spent $17.30 on fishing line. If each meter of line cost $4.90, what is y, the total length of the line?

Example 5 Read the Item You need to find which problem situation matches the equation y ● 4.9 =  You can eliminate choice A because it involves subtraction, not multiplication.  You can eliminate choice B because it involves addition, not multiplication.  You can eliminate choice C because it involves multiplying 4 and Solve the Item

Example 5  Choice D is the correct answer; the cost per meter times the number of meters should equal the total cost for the line. Answer: D

1.A 2.B 3.C 4.D Example 5 A.The cost of a new book is $7.50. How many books can Cori purchase is she has a total of $22.40? B.Kevin spends $22.40 on video games. His friend Aaron spends $7.50 more than Kevin. How much did Aaron spend? C.A board measuring 22.4 cm in length is cut into pieces. One of the pieces is 7 cm longer than the other. Find the lengths of the two pieces. D.Nicole lives 7.5 miles away from school. She travels this distance in 22.4 minutes. At what rate does Nicole travel? Which problem situation matches the equation x – 7.5 = 22.4?

REVIEW 1.The median age of people living in Arizona (34.3) is 1 year younger than the median age of people living in the US. Write an equation to find the median age in the US. x – 1 = 34.3

Which problem situations matches the equation x – 15 = 46? A.The original price of a jacket is $46. The sale price is $15 less. What is x, the sale price of the jacket? B.Mark had several baseball cards. He sold 15 of the cards and had 46 left. What is x, the amount of cards Mark had to start with? C.Sonja scored 46 points in last week’s basketball game. Talisa scored 15 points less. What is x, the amount of points Talisa scored? D.Katie earned $15 babysitting this week. Last week she earned $46. What is x, her average earnings for the two weeks? B

TEST PRACTICE 1.Asha had some change in her purse. After her brother gave her $.79, Asha had $2.24 altogether. Which equation can she use to find the original amount of the money m she had in her purse? A.2.24 = m – 0.79 B. m =2.24 x 0.79 C. m = 2.24 D. m = 0.79 C

2.Which algebraic equation best describes the total distance D traveled in miles after a 6-hour period, if r represents the rate of travel in miles per hour? F.D = 6 + r G. D = r/6 H. D = 6r I. D = 6/r H

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Resources Five-Minute Check (over Chapter 2) Image Bank Math Tools Solving Equations Using Models Perimeter Solving EquationsTwo-Step Equations

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