#### Answer

$30^{\circ}$

#### Work Step by Step

1. The interior angles of a triangle have a sum of 180 degrees
60+90+y=180
150+y=180
y=30
2. Repeat with another triangle, insert value of y:
30+90+x+y=180
150+x=180
x=30

Published by
Pearson

ISBN 10:
0321671775

ISBN 13:
978-0-32167-177-6

$30^{\circ}$

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