Answer
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Work Step by Step
Based on the result that $m_1m_2=-1$, we can conclude that if two non-vertical lines are perpendicular, then the product of the slopes of these lines is $-1$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 2 - Graphs and Functions - 2.5 Equations of Lines and Linear Models - 2.5 Exercises - Page 247: 85
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