Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 3 - Section 3.1 - Systems of Linear Equations in Two Variables - 3.1 Exercises: 27

Answer

$x=5$ $y=4$

Work Step by Step

First, we have to solve the second equation for $x$ and after that, we can substitute this expression in the first equation: $3-2y=-x$ $-3+2y=x$ $5x-4y=9$ $5(-3+2y)-4y=-15+6y=9$ $6y=24$ $y=4$ $-3+2y=-3+2(4)=5=x$ We need to check, if it is the right solution, we substitute x with $5$ and y with $4$: $5(5)-4(4)=9$ $\checkmark$ $3-2(4)=-5$ $\checkmark$
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