Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 2 - Section 2.4 - Linear Functions and Slope - Concept and Vocabulary Check - Page 151: 8



Work Step by Step

RECALL: $\text{slope} = \frac{\text{change in y}}{\text{change in x}}$ The points on a horizontal line have the same y-value. This means that for any two given points, the change in y-value is 0. Since the numerator of $\frac{\text{change in y}}{\text{change in x}}$, for whatever value of the denominator (except 0), the slope will always be equal to 0. Thus, the slope of a horizontal line is 0.
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