1. The Basic Moves for Solving an Equation
Lesson 2.11
Beginning on Pg 143

2. Can you solve these number tricks using backtracking?
Sasha says, “I pick a number.
I multiply my number by 2.
I add 3.
I subtract 8.
My final result is 13.”
What is Sasha’s starting number?
Casey says, “I pick a number.
I multiply my number by 7.
I add 18.
My final result is ten times my starting number.
What is Casey’s starting number?

3. How about this one? Emma says, “I pick a number. I add 1 to my number.
I multiply by 6.
I add 1.
My final result is 18 more than my starting number.
What is Emma’s starting number?

4. Other Methods for Solving
Equality on a Number Line
Keeping it Equal
Balancing

5. Minds in Action Pg 143
Narrator
Tony
Sasha

6. Use Sasha’s Method to Solve…
3x – = x
When you perform the same moves on each side of the equation, it doesn’t change the solutions of the equation. These are the BASIC MOVES of solving equations.

7. NOTES: BASIC MOVES

8. BASIC MOVES

9. Let’s use the basic moves to solve the equation
3s – 5 = s + 7

10. NOTES

11. Check Your Understanding
Pg 146 # 1 – 5
Work with your “elbow partners”. All three of you need to write down each question and work through them together.
You have 20 minutes.
HW: 2.11 on the yellow paper