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: 6



Work Step by Step

$3x-2y=49$ $y=-2x$ Substitute -2x for y in the first equation. $3x-2(-2x)=49$ $\longrightarrow$ simplify $7x=49$ $\longrightarrow$ divide both sides by 7 $7x\div7=49\div7$ $\longrightarrow$ simplify $x=7$ Substitute 7 for x in the second equation. $y=-2(7)$ $\longrightarrow$ simplify $y=-14$
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