# Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 638: 9

7

#### Work Step by Step

To add $-1+8$, we can take the absolute value of both numbers. $|-1|=1$ $|8|=8$ These two numbers differ in absolute value by 7. The number with the higher absolute value is positive, so the result will be positive. Therefore, $-1+8=7$.

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