Elementary Algebra

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

Chapter 2 - Real Numbers - 2.3 - Real Numbers and Algebraic Expressions - Problem Set 2.3: 75

Answer

-97.8

Work Step by Step

To evaluate the expression, we substitute the values $x=-7.8$ and $y=8.4$ into the expression, $5x-7y$ =$5(-7.8)-7(8.4)$ =$5(-\frac{78}{10})-7(\frac{84}{10})$ =$(-\frac{390}{10})-(\frac{588}{10})$ =$\frac{-390-588}{10}$ =$\frac{-978}{10}$ =$-97.8$
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