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 202: 23



Work Step by Step

We know that if the slopes of two lines are the same, then they are parallel. To check whether the slopes are the same, we put both equations in slope intercept form. The first equation is in slope intercept form. Rearranging the other equation gives: $y = -x +20.$ From this, we see that the two lines are parallel.
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