Answer
$\angle$x=39$^{\circ}$ and $\angle$y=51$^{\circ}$
Work Step by Step
y=x+12
x+y=90
x+(x+12)=90
2x=78
x=39
y=(39)+12
y=51
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 38: 26
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