Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - 9.7 Solving Equations with Several Steps - 9.7 Exercises: 9

Answer

$a=-2$

Work Step by Step

We are given the equation $28=-9a+10$. In order to solve, we can first subtract 10 from both sides. $28-10=-9a+10-10$ $18=-9a$ Divide both sides by -9. $\frac{18}{-9}=\frac{-9a}{-9}$ $a=-2$
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