Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 3 - Section 3.5 - Equations of Lines - Exercise Set - Page 174: 90



Work Step by Step

Parallel lines have the same slope. The slope of a vertical line is always undefined because using the slope equation: $\frac{rise}{run}$, a vertical line has no run. Anything divided by $0$ is undefined. Because both of the vertical lines will have undefined slopes, they must be parallel.
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