Algebra 1

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

Chapter 6 - Systems of Equations and Inequalities - Chapter Review - 6-3 and 6-4 Solving Systems Using Elimination; Applications of Systems - Page 406: 23

Answer

$(9/2,3)$ one solution

Work Step by Step

$4x +y = 21$ $-2x+6y = 9$ $-2x+6y = 9$ $2*(-2x+6y = 9)$ $-4x +12y = 18$ $4x+y-4x+12y =21+18$ $13y = 39$ $13y/13 = 39/13$ $y = 3$ $4x+y = 21$ $4x+3 = 21$ $4x+3-3=21-3$ $4x = 18$ $4x/4 = 18/4$ $x=4.5$
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