Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 34: 21



Work Step by Step

2 is negative, so it is as if instead of adding 2 to 7, we are subtracting 2 from 7. (Note, it is the 2 that is negative, so it is 7-2, not 2-7). 7-2=5
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