Answer
Slope formula
Work Step by Step
Two lines are parallel when they have the same slope. Thus, to see if two lines are parallel, we see if they have the same slope by using the slope formula.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 10 - Test - Page 495: 12a
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