Answer
$3y+8z = 18$
Work Step by Step
$2x+y+3z = 7$ Equation $(1)$
$-4x+y+2z = 4$ Equation $(2)$
Multiplying Equation $(1)$ by $2$ and adding Equation $(2)$ we get,
$4x-4x+2y+y+6z+2z = 14+4$
$3y+8z=18$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 4 - Section 4.3 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 233: 48
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