Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 10 - Radical Expressions and Equations - Cumulative Test Prep - Multiple Choice - Page 648: 14



Work Step by Step

$x+2y=23$ $4x-y=-7$ $4x-y=-7$ $4x-y+7+y=-7+7+y$ $4x+7=y$ $x+2y=23$ $x+2*(4x+7)=23$ $x+8x+14=23$ $9x+14=23$ $9x=9$ $9x/9=9/9$ $x=1$ $x+2y=23$ $1+2y=23$ $2y=22$ $2y/2=22/2$ $y=11$ $(1,11)$
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