Answer
Never
Work Step by Step
When determining if lines are parallel or perpendicular, the y-intercept will never matter. Also, lines are parallel when the two slopes are the same. Thus, lines with the same slope will always be parallel.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 5 - Linear Functions - 5-6 Parallel and Perpendicular Lines - Practice and Problem-Solving Exercises - Page 334: 30
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