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 - Review Exercises: 17

Answer

{(-2,-1)}

Work Step by Step

3x+y=-7 3x-3x+y=-7-3x y=-7-3x Plug this value for y into the other equation. 2x-5y=1 2x-5(-7-3x)=1 2x-5(-7)-5(-3x)=1 2x+35+15x=1 2x+15x+35=1 17x+35=1 17x=1-35 17x=-34 x=-$\frac{34}{17}$ x=-2 Plug this value for x into the first equation to find y. y=-7-3x y=-7-3(-2) y=-7+6 y=-1 Therefore the solution is (-2,-1)
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