Answer
x + y = 180
Work Step by Step
Since $\angle$1 and $\angle$2 are supplementary; m$\angle$1 + m$\angle$2 = 180.
Substitute in x for $\angle$1 and y in for $\angle$2.
x + y = 180.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.4 - Angles and Their Relationships - Exercises - Page 37: 14a
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