#### Answer

$x=9$

#### Work Step by Step

Lines that have an undefined slope take the form $x=a$, where $a$ is the $x-$intercept. Since the line passes throught $(
9,10
)$, then the equation is
\begin{array}{l}\require{cancel}
x=9
.\end{array}

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

$x=9$

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