Answer
$x=95$ degrees, $y=123$ degrees, $z=70$ degrees
Work Step by Step
$x+y+z+72=360$
$x+z+15=180$
$y+z-13=180$
$x+y+z=288$
$x+z=165$
$y+z=193$
$x+y+z-x-z=288-165$
$y=123$
$y+z=193$
$123+z=193$
$z=70$
$x+z=165$
$x+70=165$
$x=95$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 9 - Section 9.1 - Solving Systems of Linear Equations in Three Variables and Problem Solving - Exercise Set - Page 640: 42
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