Answer
$$ x=-1.$$
Work Step by Step
The slope is given by
$$ m=\frac{6-4}{-1-(-1)}=\frac{2}{0}=\infty $$
so the line is vertical has the form $x=c$. Thus:
$$ x-(-1) =0\Longrightarrow x=-1.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - Chapter Review Exercises - Page 36: 18
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