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 - Chapter Review - Page 208: 17

Answer

x = 20 degrees

Work Step by Step

If l and m are parallel, then the two angles and up to 180 degrees. Thus, we find: $130+(2x+10) = 180\\ 140+2x=180\\ 2x=40\\ x=20$
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