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Chapter 5 Review

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**5.1 Write Linear Eqns in Slope-Intercept Form**

Example 1 Write an equation of the line shown.

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Step 1: y = mx + b Step 2: Find b. (y-intercept) b = 4 Step 3: Find m. (slope = rise/run) m = -2/3 Step 4: Write equation y = (-2/3)x + 4

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Assignment: Pg. 345 # 4 - 6

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**You have a $25 gift card for a bagel shop. A bagel costs $1. 25**

You have a $25 gift card for a bagel shop. A bagel costs $1.25. Write an equation that gives the amount (in dollars) that remains on the card as a function of the total number of bagels you have purchased so far. How much money is on the card after you buy 2 bagels? T = b (b= number of bagels, T = total) T = (2) = $22.50

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**5.2 Use Linear Equations in Slope-Intercept Form**

Example 2 Write an equation of the line that passes through the point (-2,-6) and has a slope of 2. Step 1: y = mx + b Step 2: Find b (y-intercept) y = mx + b -6 = 2(-2) + b -6 = -4 + b -2 = b Step 3: Write Equation y = 2x - 2

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Assignment: Pg. 346 #

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**5.4 Write Linear Equations in Standard Form**

Example 3 Write an equation in standard form of the line shown. (-1,1) and m = -2

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**(-1,1) and m = -2 Step 1: y = mx + b Step 2: Find b 1 = (-2)(-1) + b**

-1 = b Step 3: Write equation y = -2x - 1

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Assignment: Pg. 347 #

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**5.5 Write Equations of Parallel and Perpendicular Lines**

Example 4 Write an equation of the line that passes through (-4,-2) and is perpendicular to the line y = 4x - 7. Hint: Perpendicular lines have slopes that are the negative reciprocal of each other. Step 1: Find slope. y = 4x -7 m = 4, so slope of perpendicular line is - 1/4.

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Write an equation of the line that passes through (-4,-2) and is perpendicular to the line y = 4x - 7. Step 2: Find b. y = mx + b -2 = (-1/4)(-4) + b -2 = 1 + b -3 = b Step 3: Write Equation y = (-1/4)x - 3

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**5.5 Write Equations of Parallel and Perpendicular Lines**

Example 5 Write an equation of the line that passes through (-4,-2) and is parallel to the line y = 4x - 7. Hint: Parallel lines have the same slopes. Step 1: Find slope. y = 4x - 7 m = 4, so the slope of a parallel line is 4.

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**Write an equation of the line that passes through (-4,-2) and is parallel to the line y = 4x - 7.**

Step 2: Find b. y = mx + b -2 = 4(-4) + b -2 = b 14 = b Step 3: Write equation. y = 4x + 14

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Assignment: Pg. 347 #

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**5.6 Fit a Line of Data Example 6**

The table shows the time needed to roast turkeys of different weights. Make a scatter plot of the data. Describe the correlation of the data. Weight (pounds) 6 8 12 14 18 20 24 Roast time (hours) 2.75 3.00 3.50 4.00 4.25 4.75 5.25

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**Make a scatter plot of the data. Describe the correlation of the data.**

Because the graph rises from left to right, it has a positive correlation

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**5.6 Fit a Line of Data Step 1: Find the pattern on the data.**

- positive correlation - rises from left to right. - negative correlation - falls from left to right. - no correlation - no real pattern. Step 2: Draw line. half the points above and half the points below. Step 3: Write equation. y = mx + b

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Assignment: Pg. 348 # 21

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**5.7 Predict with Linear Models**

Example 7 Use the scatter plot from the example for Lesson 5.6 above to estimate the time (in hours) it takes to roast a 10 pound turkey. Step 1: Draw scatter plot Step 2: Draw Line of best fit. Step 3: Find x-coordinate and y-coordinate on the line.

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**It takes about 3.25 hours to cook a 10 pound turkey.**

Use the scatter plot from the example for Lesson 5.6 above to estimate the time (in hours) it takes to roast a 10 pound turkey. It takes about 3.25 hours to cook a 10 pound turkey.

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Assignment: Pg. 348 # 22

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Assignment Pg. 942 #2-8 even, even

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