Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 4 - Section 4.2 - Solving Systems of Linear Equations by the Substitution Method - Exercise Set - Page 300: 4



Work Step by Step

y=2x+7 Plug this value for y into the other equation. 2x-3y=-13 2x-3(2x+7)=-13 2x-3(2x)-3(7)=-13 2x-6x-21=-13 -4x-21=-13 -4x=-13+21 -4x=8 x=$\frac{8}{-4}$ x=-2 Plug this back into the first equation to find y. y=2(-2)+7 y=-4+7 y=3 Therefore, the solution is {(-2,3)}
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