1. Lesson 8: Solving multi-step equations
Texas Algebra I
Instructor: Mrs. Young
Lesson 8:
Solving multi-step equations

2. Lesson Objectives: TEKS: A.2; A.3a
Use inverse operations to solve multi-step equations
Synthesize information from previous lessons to solve algebraic equations.

3. Quick Review Undo each other Inverse operations
Combine like-terms
Properties of equality
Undo each other
Terms with same variable and power
Do same thing to both sides of equation

4. Result: Single-step
Result: Multi-step

5. Getting dressed Shoes and socks Algebra P E M/D A/S
Shoes and socks
Algebra
First, put on socks
Then, put on shoes

6. Getting undressed: Shoes and socks Algebra
like getting dressed…in reverse! P E
M/D
A/S
Shoes and socks
Algebra
First, take off shoes
If putting on shoes
was subtracting 7, then
Taking off shoes is add 7!
Then, take off socks
If putting on socks was multiply by 4, then taking off socks would be divide by 4!

7. Guided practice: ←take off shoes 2. take off socks
←take off shoes
What are the “shoes” in this problem?
2. take off socks
What are the “socks” in this problem?

8. Guided practice: 1. take off shoes ← take off socks
1. take off shoes
What are the “shoes” in this problem?
Adding 8, so subtract 8 to solve!
← take off socks
What are the “socks” in this problem?

9. Guided practice: 1. take off shoes ← take off socks
1. take off shoes
What are the “shoes” in this problem?
Adding 8, so subtract 8 to solve!
← take off socks
What are the “socks” in this problem?
Multiplying by 9, so divide by 9 to solve!

10. Lesson Objectives: Review
Use inverse operations to solve multi-step equations
Synthesize information from previous lessons to solve algebraic equations.