Answer
70 degrees and 20 degrees
Work Step by Step
$x+y=90$
$x=3y+10$
$x+y=90$
$3y+10+y=90$
$4y=80$
$4y/4=80/4$
$y=20$
$x=3y+10$
$x=3*20+10$
$x=60+10$
$x=70$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 4 - Section 4.4 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 321: 37
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