Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 9 - Section 9.3 - Solving Pairs of Linear Equations by Substitution - Exercises - Page 334: 4



Work Step by Step

$2x-y=4$ $y=-x$ Substitute -x for y in the first equation. $2x-(-x)=4$ $\longrightarrow$ simplify $3x=4$ $\longrightarrow$ divide both sides by 3 $3x\div3=4\div3$ $\longrightarrow$ simplify $x=1\frac{1}{3}$ Substitute $1\frac{1}{3}$ for x in the second equation. $y=-1\frac{1}{3}$
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