1. Subtracting Integers
Sec 2.3 pg

2. Subtracting Integers Let’s look at the following problem. 5 – 8
When you subtract 8, it is the same as adding its opposite, - 8.
So, 5 – 8 is the same as 5 + (-8).
|5| = 5 and |- 8| = 8.
Since the signs are not the same, you find the difference between the absolute value.
8 – 5 = 3.
Is the answer positive or negative?
Negative. The absolute value of – 8 is larger so we use its sign.
5 – 8 = - 3

3. Subtracting Integers To subtract an integer, you add its opposite.
Subtract positive integers.
5 – 9
This becomes 5 + (- 9)
|5| = 5 and |-9| = 9.
Find the difference. 9 – 5 = 4
The absolute value of – 9 was larger, so we take its sign.
5 – 9 = - 4.

4. Subtracting Integers Subtract negative integers. 10 – (-4)
This become You add the opposite of a – 4.
= 14
-9 – (- 2)
The |-9| = 9 and |2| = 2, so 9 – 2 = 7. This becomes -7 since the absolute value of -9 is larger and we take its sign.
- 9 – ( - 2) = - 7

5. Evaluate expressions Evaluate the expression if a = -5 and b = 9 b – a
This becomes 9 – ( - 5)
To subtract integers you add the opposite, so
9 + 5 14