Calculus (3rd Edition)

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


$$ x=-1.$$

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: $$ x-(-1) =0\Longrightarrow x=-1.$$
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