Answer
$r=1$
Work Step by Step
We are given the equation $-8=-9+r$. In order to solve, we must add 9 to both sides.
$-8+9=-9+r+9$
Therefore, $r=1$.
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - Review Exercises - Page 698: 78
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