#### 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:
$$ m_1 = \frac{1}{-m_2}$$

Published by
Prentice Hall

ISBN 10:
0133281140

ISBN 13:
978-0-13328-114-9

perpendicular

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