Elementary Geometry for College Students (7th Edition) Clone

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 2 - Section 2.2 - Indirect Proof - Exercises - Page 94: 35

Answer

1. Let's consider the plane to be a plane like the x-y coordinate plane. If a line is parallel to another line in the same plane, then it has the same slope as that line. 2. Thus, the two lines that are parallel to the third line have the same slope. 3. By definition, because the lines have the same slope, they are parallel.

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