1. March 4, Math 201
OBJECTIVE: Students will be able to solve and explain two-step equations involving whole numbers.
AIM: How do we use inverse operations to isolate the variable on one side of the equal sign?
STANDARDS: 6.A.4
PRIOR KNOWLEDGE: What number can I add to 5 to make it zero? What number can I add to -7 to make it zero? What number will divide 4 to make it 1? What number can I multiply ½ to make it 1?

2. MINILESSON:
Solving an equation means finding the number that replaces the variable in the equation
Look at n + 3 = 5
You can solve this equation mentally by asking “What number added to 3 equals 5?”
But what if the equation is 8n – 26 = 70
You might need a strategy to simplify the computation

3. But what if the equation is 8n – 26 = 70
You might need a strategy to simplify the computation
BEST WAY GET THE VARIABLE BY ITSELF
Example 8n – 26 = 70
If we want to get the n all by itself on the left side, we first look at numbers without a variable on the same side.

4. 8n – 26 = 70
We ask “What inverse operation can I use to cancel that number out and get rid of it?”
REMEMBER, if I do something to the left side of the equal sign, I have to do the same thing on the right side
That leaves me

5. What is going on with the variable now?
So, what inverse operation can we use to get rid of it?
REMEMBER to do the same thing to the other side
Now, we finally isolated the variable

6. Example 4y – 6 = 30
Strategy: Isolate the variable
Step 1: Get rid of constants by doing the inverse
Step 2: Get rid of coefficients by doing the inverse

7. You try! Solve for n
5n + 15 = 55
Strategy: Isolate the variable
Step 1: Get rid of constants by doing the inverse
Step 2: Get rid of coefficients by doing the inverse

8. Practice: Solve the equation
6y – 2 = 52
7a + 11 = 67

9. HOMEWORK due March 5
NOTE: To be completed in pencil on a separate piece of paper with your name and date on it!
Solve the equation:
9a + 15 = 78
4n – 23 = 13
8z – 20 = 44
6y + 23 = 71
5n + 12 = 42