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: 5



Work Step by Step

$3x+2y=30$ $x=y$ Substitute y for x in the first equation. $3y+2y=30$ $\longrightarrow$ simplify $5y=30$ $\longrightarrow$ divide both sides by 5 $5y\div5=30\div5$ $\longrightarrow$ simplify $y=6$ Substitute 6 for y in the second equation. $x=6$
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