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 - Lesson Check - Page 201: 5

Answer

The answer is below.

Work Step by Step

For parallel lines, the slope does not change. Thus, your classmate should not have changed the slope to 1/3.
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