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Big Ideas Math Integrated I, 2016

BI

Big Ideas Math Integrated I, 2016 View details

1. Writing Equations in Slope-Intercept Form

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Exercise 32 Page 170

Think about the cost of mailing a package that weighs x pounds.

See solution.

Practice makes perfect

Let's pretend that x is the weight of a package we want to mail and y is the total cost of mailing it. Since the graph passes through the point (0,20), we can assume that there is a fee of $20 that applies to any package. Now, let's calculate the slope of this line using the Slope Formula.

m=y_2-y_1/x_2-x_1

SubstitutePoints

Substitute ( 0,20) & ( 4,80)

m=80- 20/4- 0

Subtract terms

m=60/4

Calculate quotient

m=15

The slope is 15. This means that increasing the weight of a package by a pound will increase the total cost of mailing it by $15.

Subchapter links

Communicate Your Answer p.165

Monitoring Progress p.167-168

Exercises p.169-170