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: 9

Answer

(1,5)

Work Step by Step

Multiply the second equation by -1. Add the equations to eliminate x. $2x+4y=22\ \ \ \ $multiply by -1$\ \ \ \ -2x-4y=-22$ $2x-2y=-8\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \underline{2x-2y=-\ \ 8}$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -6y=-30$ Solve for y. $-6y=-30$ $-6y\div-6=-30\div-6$ $y=5$ Substitute 5 for y in either equation. Solve for x. $2x-2(5)=-8$ $2x-10+10=-8+10$ $2x=2$ $2x\div2=2\div2$ $x=1$
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