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Big Ideas Math: Modeling Real Life, Grade 8
BI
Big Ideas Math: Modeling Real Life, Grade 8 View details
2. Slope of a Line
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Exercise 13 Page 152

Given a graph, can you think of two different ways to find the slope?

There is no answer for this exercise
Practice makes perfect

Observing the given graph, we can see that the line passes through the points (-1,3) and (3,3). We can use a graph to find the slope of a line. Let's take a look at the change in x and y between the given points.

We can see that the line is a horizontal line so its slope is 0. We can confirm this answer by using the formula. m = y_2-y_1/x_2-x_1 We will use the given points to solve for the slope.

m = y_2-y_1/x_2-x_1
SubstitutePoints

Substitute ( -1,3) & ( 3,3)

m=3- 3/3-( -1)
SubNeg

a-(- b)=a+b

m=3-3/3+1
AddSubTerms

Add and subtract terms

m=0/4

0/a=0

m=0

We got the same number as before. We can be sure the slope is 0.

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arrow_right Try It p.149-150
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Try It 2 (Page 149)
Try It 3 (Page 149)
Try It 4 (Page 149)
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arrow_right Self-Assessment for Concepts & Skills p.150
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Self-Assessment for Concepts & Skills 7 (Page 150)
Self-Assessment for Concepts & Skills 8 (Page 150)
Self-Assessment for Concepts & Skills 9 (Page 150)
arrow_right Self-Assessment for Problem Solving p.151
Self-Assessment for Problem Solving 10 (Page 151)
Self-Assessment for Problem Solving 11 (Page 151)
Self-Assessment for Problem Solving 12 (Page 151)
arrow_right Review & Refresh p.152
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