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: 8



Work Step by Step

$15x+3y=9$ $y=-2x$ Substitute -2x for y in the first equation. $15x+3(-2x)=9$ $\longrightarrow$ simplify $9x=9$ $\longrightarrow$ divide both sides by 9 $9x\div9=9\div9$ $\longrightarrow$ simplify $x=1$ Substitute 1 for x in the second equation. $y=-2(1)$ $\longrightarrow$ simplify $y=-2$
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