1. 2
Chapter
Chapter 2
Integers and Introduction to Variables

2. Section
2.4
Subtracting Integers

3. Objective A
Subtract Integers.

4. Subtracting Integers Subtracting Integers
Subtracting Two Numbers
If a and b are numbers, then a – b = a + (–b).
Objective A 4

5. Example Example Subtract. a. 6 – 10 = 6 + (‒10) = ‒4 b. ‒14 – 19
= ‒14 + (‒19)
= ‒33
= ‒12 + 6
= ‒6
Objective A 5

6. Add and Subtract Integers
Objective B
Add and Subtract Integers

7. Example
Simplify: 12 – 5 – 7
Objective B

8. Example Example Simplify: 9 – 6 – (‒3) + 8
9 – 6 – (‒3) + 8 = 9 + (–6) =
= 6 + 8
Objective A
= 14 8

9. Evaluate an Algebraic Expression by Subtracting.
Objective C
Evaluate an Algebraic Expression by Subtracting.

10. Evaluating Expressions
Example
Evaluate 3x + y for x = 2 and y = – 6.
Replace x with 2 and y with –6 in 3x + y.
3x + y = 3 · 2 + (–6)
Objective B
= 6 + (–6)
= 6 – 6
= 0

11. Solve Problems by Subtracting Integers.
Objective D
Solve Problems by Subtracting Integers.

12. Example
Example
In the card game Canasta, it is possible to have a negative score. If Juan’s score is 15, what is his new score if he loses 20 points?
because –20 has a negative sign and was the larger of the two numbers
Objective A 12