Answer
See below
Work Step by Step
Given: $4x+5y=18\\-x+2y=15$
Multiply the second equation by $4$:
$4x+5y=18\\
-4x+8y=60$
Then we have $16y=78\\
\rightarrow y=6$
Substitute: $-x+2(6)=15\\
\rightarrow -x=3\\
\rightarrow x=-3$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.10 Write Quadratic Functions and Models - 4.10 Exercises - Mixed Review - Page 315: 59
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