Algebra 1

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

Chapter 6 - Systems of Equations and Inequalities - 6-3 Solving Systems Using Elimination - Practice and Problem-Solving Exercises - Page 378: 12

Answer

(4,3)

Work Step by Step

Multiply the second equation by -1. Add the equations to eliminate y. $6x+5y=39\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 6x+\ 5y=\ \ \ 39$ $3x+5y=27\ \ \ \ $multiply by -1$\ \ \ \ \ \ \ \ \ \ \ \underline{\ -3x-5y=-27}$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 3x\ \ \ \ \ \ \ \ \ =\ \ 12$ Solve for x. $3x=12$ $3x\div3=12\div3$ $x=4$ Substitute 4 for x in either equation and solve for y. $6(4)+5y=39$ $24+5y-24=39-24$ $5y=15$ $5y\div5=15\div5$ $y=3$
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