Intermediate Algebra (6th Edition)

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

Chapter 3 - Section 3.4 - The Slope of a Line - Vocabulary, Readiness & Video Check - Page 161: 13


The slope rules for parallel lines and perpendicular lines indicate non vertical lines only. $|=\\$This is because vertical lines have no slope (or undefined slope), so you cannot have equal slopes or slopes that are negative reciprocals of each other.

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