Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 5 - Linear Functions - 5-6 Parallel and Perpendicular Lines - Practice and Problem-Solving Exercises - Page 331: 13



Work Step by Step

Two non-vertical lines are perpendicular if the product of their slopes is $-1$. The equations $y=x+11$ and $y=-x+2$ have slopes of $1$ and $-1$, respectively. Since $1\times-1=-1$, the lines are perpendicular.
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