Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 3 - Section 3.3 - Slope - Exercise Set - Page 243: 54

Answer

If the slope of a line is undefined, that means the line is vertical.

Work Step by Step

If the slope is undefined, that means that the denominator, the change in $x$, is zero. You cannot divide by zero; the answer is undefined. If the slope of a line is undefined, that means the line is vertical.
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