Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 4 - Proportions, Percents, and Solving Inequalities - Chapters 1-4 Cumulative Review Problem Set: 19

Answer

$5$

Work Step by Step

Combining like terms, the given expression simplifies to: $5x-7y-8x+3y$ =$5x-8x+3y-7y$ =$x(5-8)+y(3-7)$ =$-3x-4y$ We then substitute $x=9$ and $y=-8$ in the expression and simplify: $-3x-4y$ =$-3(9)-4(-8)$ =$-27+32$ =$5$
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