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: 12



Work Step by Step

$5x+2y=1$ $y=-3x$ Substitute -3x for y in the first equation. $5x+2(-3x)=1\longrightarrow$ simplify $5x-6x=1\longrightarrow$ simplify $-1x=1\longrightarrow$ divide both sides by -1 $-1x\div-1=1\div-1\longrightarrow$ simplify $x=-1$ Substitute -1 for x in the second equation. $y=-3(-1)\longrightarrow$ simplify $y=3$
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