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 - 3-3 Proving Lines Parallel - Practice and Problem-Solving Exercises - Page 163: 50


I) 19

Work Step by Step

The two labeled angles form a linear pair, because their non-common rays form a line. \begin{array} {ll} \\2x+(8x-10)=180 & \text{Definition of Linear Pair} \\10x-10=180 & \text{Combine like terms} \\10x=190 & \text{Addition Property of Equality} \\x=19 & \text{Division Property of Equality} \end{array}
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