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.
$\frac{18}{-9}=\frac{-9a}{-9}$
$a=-2$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
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 - Page 678: 9
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