Answer
perpendicular
Work Step by Step
Two lines are perpendicular if their slopes are negative reciprocals of each other. For two lines with slopes $m_1$ and $m_2$, this means:
$$ m_1 = \frac{1}{-m_2}$$
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 11 - Rational Expressions and Functions - Common Core Cumulative Standards Review - Vocabulary Builder - Page 720: B
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