Answer
$-\dfrac{1}{2}$
Work Step by Step
RECALL:
Perpendicular lines have slopes whose product is $-1$.
Thus, the two lines are perpendicular if $a=-\dfrac{1}{2}$ since $2(-\frac{1}{2})=-1$.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 2 - Section 2.3 - Lines - 2.3 Assess Your Understanding - Page 178: 8
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