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 $(7,-6),$
$x=7$
Calculus with Applications (10th Edition)
by Lial, Margaret L.; Greenwell, Raymond N.; Ritchey, Nathan P.
Published by
Pearson
ISBN 10:
0321749006
ISBN 13:
978-0-32174-900-0
Chapter 1 - Linear Functions - Chapter Review - Review Exercises - Page 40: 34
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