## Geometry: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 3 - Parallel and Perpendicular Lines - 3-8 Slopes of Parallel and Perpendicular Lines - Lesson Check - Page 201: 1

Perpendicular

#### Work Step by Step

Slope of AB: $m=\frac{11-3}{-4--8}$ $m=2$ Slope of CD: $m=\frac{3-2}{-1-1}$ $m=-\frac{1}{2}$ Because $-\frac{1}{2}$ is the negative recipricol of 2, lines AB and CD are perpendicular.

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