1. Two-Step Equations
CA 5.0

2. Objective: To Solve Two-Step Variable Equations

3. When solving equations think ORDER OF OPERATIONS in reverse!
Undo Addition or Subtraction first!
Then undo Multiplication or Division.

4. STEPS REASON
Given
Addition Axiom of Equality
Simplify
Multiplication Axiom of Equality
Simplify

5. Solve.
1) 5x + 4 = 39
3) x = 12
5x = 35
(-1)
- x = 5
(-1)
x = -5
x = 7 2) 4)
(3)
(3)
(-5)
(-5)
x = 18
-35 = x

6. What about those nasty fractions?
When you have an
EQUATION
you can eliminate fractions by multiplying EVERYTHING by the LCD!

7. ( ) 3 3 15

8. CHECK your WORK 
USE SUBSTITUTION ! 