Answer
Slope formula
Work Step by Step
To see if two lines are parallel, we must see whether or not the two lines have the same slope. Therefore, the best formula to use in this case is the slope formula.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 10 - Section 10.3 - Preparing to Do Analytic Proofs - Exercises - Page 474: 31d
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