Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 3 - Parallel and Perpendicular Lines - 3-8 Slopes of Parallel and Perpendicular Lines - Practice and Problem-Solving Exercises - Page 203: 39


The answer is below.

Work Step by Step

If two lines are parallel, then they have the same slope, which we will can s. If another line is parallel to that line, then it also has a slope of s. Thus, all three lines have a slope of s. From this, we can see that if two lines are parallel to the same line, then they are parallel to each other as well.
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