#### Answer

$x=7$

#### Work Step by Step

If the slope is undefined, the line is vertical
(parallel to the y-axis).
A line parallel to it is also vertical.
The equation of such lines is of the form
$x=a$
If it passes through $(7,-6),$
$x=7$

Published by
Pearson

ISBN 10:
0321749006

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

$x=7$

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.