Answer
$(1, 2, 5)$
Work Step by Step
A: $5x= 5$
B: $2x+y=4$
C: $3x+y-4z=-15$
$5x=5$
$5x/5 =5/5$
$x=1$
$2x+y=4$
$2*1+y=4$
$2+y=4$
$y=2$
$3x+y-4*z=-15$
$3*1+2-4z=-15$
$3+2-4z=-15$
$5-4z=-15$
$20-4z=0$
$20=4z$
$20/4 = 4z/4$
$z=5$
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 637: 4
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