To subtract integers, add the opposite of the number being subtracted. This works because subtraction is the inverse of addition. The document provides examples of subtracting integers in word problems, algebraic expressions, and evaluating expressions by substituting values for variables. It also includes a warm up section with more practice problems subtracting and evaluating expressions with integers.

1. 1.5 Subtracting Integers

2. Subtracting Two Integers
Words Numbers Algebra
To subtract an 3 – 7 = 3 + (-7) a – b = a + (- b)
integer, add its
opposite. 5 – (-8) = 5 + 8 a – (-b) = a + b

3. Example 1: Subtract
1. -5–9
2. - 8 – (- 6)
3. 8 – (- 4)
4. - 11 – ( - 6)

4. Example 2: Evaluate each expression
1. 9 – h for h = -8
2. - 7 – m for m = -5
3. l-3 – k l + l -3l for k = 12

5. Warm up 1.5
Subtract
1. – 6 – ( -4)
2. - 3 – 3
3. 4 – ( - 5)
Evaluate the expression
4. 9 – s for s = - 5
5. - 4 – w + 5 for w = 21