Answer
$16$
Work Step by Step
$x+y=20$ ...(1)
$3x-2y=40$ ...(2)
From equations (1) and (2), we have
$y=(20-x)$
Plug $y=(20-x)$ in $3x-2y=40$ .
$3x-2(20-x)=40$
$3x-40+2x=40$
$5x=40+40$
$x=16$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-5 Completing the Square - Standardized Test Prep - Page 566: 56
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