Chapter 1.5, Problem 2P

Use a number line to find each sum.

$-7+8$

To determine

To find: The sum $-7+8$ by the use of number line.

Explanation of Solution

Given:

The sum is $-7+8$ .

First draw a number line.

Now find the location for $-7$ on the number line.

Now move the right side by 8 units from the first integer -7 since the second integer is positive.

Figure 1

It can be seen that the value is 1.

Conclusion:

Therefore, the sum of $-7+8$ is 1.