#### Answer

x=4

#### Work Step by Step

m=$\frac{y_2-y_1}{x_2-x_1}$
m=$\frac{12-5}{4-4}$
m=$\frac{7}{0}$
m=undefined.
Therefore, the equation is x=4.

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

x=4

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