Answer
$x=4$
$y=8$.
Work Step by Step
By substitution, we have
$$
5x-y=12, \ y=2x\Longrightarrow 5x-2x=12\Longrightarrow 3x=12 \Longrightarrow x=12/3=4
.$$
Hence $x=4$ and then $y=2(4)=8$.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Cumulative Review - Page 446: 13
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