Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 2 - Equations, Inequalities, and Problem Solving - Mid-Chapter Review - Mixed Review - Page 103: 13



Work Step by Step

Using the properties of equality, the solution to the given equation, $ \dfrac{9}{10}y-\dfrac{7}{10}=\dfrac{21}{5} $, is \begin{array}{l} 10\left(\dfrac{9}{10}y-\dfrac{7}{10}\right)=\dfrac{21}{5}(10) \\\\ 1(9y)-1(7)=21(2) \\\\ 9y-7=42 \\\\ 9y=42+7 \\\\ 9y=49 \\\\ y=\dfrac{49}{9} .\end{array}
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