Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 1 - Graphs - 1.3 Lines - 1.3 Assess Your Understanding - Page 31: 60



Work Step by Step

If a line is vertical, then its equation must be in the form $x=h$ where $h$ is a real number. All points on the line have the same $x$-coordinate. The line is vertical and contains the point $(4,-5)$, the $x$-coordinate of which is $4$. Hence, the equation of the line must be $x=4$.
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