Answer
Opposite reciprocals
Work Step by Step
Two lines are perpendicular if the product of their slopes is −1. The only way we can guarantee that a product is −1 is if we have opposite reciprocals, because a×−1/a=−1.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 5 - Linear Functions - Chapter Review - Page 353: 4
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