Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 8 - Coordinate Geometry and Linear Systems - 8.4 - Writing Equations of Lines - Concept Quiz 8.4 - Page 359: 2



Work Step by Step

In order for two lines to be perpendicular, their slopes must be $\underline{opposite}$ reciprocals, not just reciprocals. For example, two lines with slopes $3$ and $\frac{1}{3}$, respectively, are not perpendicular, but two lines with slopes $3$ and $-\frac{1}{3}$, respectively are perpendicular.
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