Answer
Vertical
Work Step by Step
Using the equation for slope, we find:
$$ m =\frac{y_2-y_1}{x_2-x_1} =\frac{9-4}{4-4} = \frac{5}{0}$$
The slope is undefined, so the line is vertical.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 2 Linear Equations and Functions - 2.2 Find Slope and Rate of Change - 2.2 Exercises - Skill Practice - Page 86: 11
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