Answer
When $b$ is greater in magnitude than $a$.
Work Step by Step
Recall, subtracting a negative is the same as addition. Thus, if $b$ is greater in magnitude than $a$, it will be added to $a$ to yield a positive number.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 50: 142
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