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 - Test - Page 339: 6



Work Step by Step

2x-y=7 2x-2x-y=7-2x -y=7-2x -1(-y)=-1(7-2x) y=-7+2x Plug this value for y into the other equation 3x+2y=0 3x+2(-7+2x)=0 3x-14+4x=0 3x+4x-14=0 7x-14=0 7x-14+14=0+14 7x=14 x=$\frac{14}{7}$ x=2 Plug this value for x into the first equation to find y y=-7+2(2) y=-7+4 y=-3 Therefore the solution is {(2,-3)}
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