#### Answer

$x=-6$

#### Work Step by Step

Vertical lines have equations of form
$x=a$
(all points have the same x-cordinate, a).
Here, $a=-6$, so the equation is
$x=-6$

Published by
Pearson

ISBN 10:
0321749006

ISBN 13:
978-0-32174-900-0

$x=-6$

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