Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Cumulative Review: 6

Answer

$x=-2$ and $y=-7$

Work Step by Step

Given the equations $-6x+y=5$ and $4x-2y=6$ $1.)$ Isolate $y$ in the first equation: $-6x+y=5\longrightarrow y=6x+5$ $2.)$ Substitute $y$ in the second equation: $4x-2y=6\longrightarrow 4x-2(6x+5)=6$ $3.)$ Divide by $2$: $4x-2(6x+5)=6\longrightarrow 2x-(6x+5)=3$ $4.)$ Solve for $x$: $2x-(6x+5)=3\longrightarrow 2x-6x-5=3\longrightarrow -4x=3+5\longrightarrow x=\dfrac{8}{-4}=-2$ $5.)$ Substitute $x$ in the equation from step $1$: $y=6x+5\longrightarrow y=6(-2)+5\longrightarrow y=-12+5\longrightarrow y=-7$ Therefore the solutions is $x=-2$ and $y=-7$
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