Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 1 - Graphs - 1.3 Lines - 1.3 Assess Your Understanding - Page 30: 8



Work Step by Step

We know that two non-vertical lines are perpendicular if the product of their slopes is $-1$. The slope of the other line is $2$. Hence, the slope of the line perpendicular to it is: $2\cdot a=-1\\ a=-\frac{1}{2}$
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