1. Solve for variable 3x = 6 7x = -21
Do Now
Solve for variable
3x = 6
7x = -21

2. Solving Two Step Equations
Rules
Combine like terms and simplify anything you can
Add or subtract constant from both sides (do opposite)
Multiply or Divide coefficient from both sides (get variable by itself, do opposite)
Solve for variable
Substitute answer back in to original problem to check answer

3. Solving Two Step Equations
Example 1
2x – 3 = 7
(Step 2)
2x = 10 (Step 3)
x = 5 (Step 4)
Check
2 (5) – 3 = 7
10 – 3 = 7
7 = 7 ✔
Step 1 – Can we simplify?
Step 2 – what is the constant? (-3) Add 3 to both sides of the equation
Step 3 – what is the coefficient (2) Divide 2 by both sides of the equation
Step 4 Solve
Step 5 Check

4. Solving Two Step Equations
Example 2
5x + 8 = 43
5x = 35 5
X = 7
Check
5(7) + 8 = 43
= 43
43 = 43 ✔
Step 1 – Can we simplify?
Step 2 – what is the constant? (8) Subtract 8 to both sides of the equation
Step 3 – what is the coefficient (5) Divide 5 by both sides of the equation
Step 4 Solve
Step 5 Check

5. Solving Two Step Equations
Example 3
-2x + 6 = 10
Step 1 – Can we simplify?
Step 2 – what is the constant? Do we add or subtract?
Step 3 – what is the coefficient? Do we multiply or divide
Step 4 Solve
Step 5 Check

6. Solving Two Step Equations
Example 4 3x + 6 = 12
Step 1 – Can we simplify?
Step 2 – what is the constant? Do we add or subtract?
Step 3 – what is the coefficient? Do we multiply or divide
Step 4 Solve
Step 5 Check

7. Solving Two Step Equations
On your Own
Equation Check
6x + 12 = - 24
-3x – 10 = 20
4x = 12
2x - 4 = 8