## Algebra 1: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 5 - Linear Functions - 5-1 Rate of Change and Slope - Practice and Problem-Solving Exercises - Page 299: 32

-60

#### Work Step by Step

We are given two points: (1,200) and (3,80). (Note, time is the independent variable as how far away the car is from its destination does not change what time it is. This makes where the car is the dependent variable). In order to find the slope, we use the following equation: $\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$. Thus, we obtain: $\frac{200-80}{1-3}=\frac{120}{-2}=-60$

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