Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 1 - Precalculus Review - 1.2 Linear and Quadratic Functions - Preliminary Questions - Page 17: 2



Work Step by Step

Comparing with y=mx+c, the slope m of the first line is 2 and that of the second line is -2. When we multiply a slope by its perpendicular slope we get -1 as the result. Here, product of the slopes=$2\times-2\ne-1 $. Therefore, the lines are not perpendicular.
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