Answer
If two lines are perpendicular, then the product of their slopes is $-1$.
Work Step by Step
If two lines are perpendicular, then the product of their slopes is $-1$.
These two lines will meet at right angles to one another.
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 3 - Section 3.3 - Slope - Exercise Set - Page 243: 56
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