Answer
$2$
Work Step by Step
RECALL:
Parallel lines have equal slopes but have different y-intercepts.
Thus, the two lines are parallel if $a=2$.
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: 7
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