splash screen. main idea/vocabulary solve addition and subtraction equations

• Solve addition and subtraction equations.

What is an Algebraic Equation

• An algebraic equation has numbers, operations, variables, and ____________.

• Example: x – 5 = 11• We need to know how to solve them

• I think of a teeter tot or a see saw…how many of you have used one of those items?

• The idea is to keep things balanced• Also, since in an algebraic equation you know the

end answer, you need to work backwards to find the missing piece, like a detective!

• We use inverse operations. These are operations that un-do each other. Addition and __________ are inverse operations.

How to solve Algebraic Equations

• x + 5 = 11• x + 5 = 11 Step 1: Write down the problem - 5 - 5 Step 2:Draw the line through equal sign; Step 3: inverse operation• x = 6 Step 4: Solve the problem (Inverse operation helps to isolate the

variable)

• x - 11 = 3• x - 11 = 3 Step 1: Write down the problem +11 +11 Step 2:Draw the line through equal sign; Step 3: inverse operation• x = 14 Step 4: Solve the problem (Inverse operation helps to isolate the

variable)

• x - 5 = 1• x - 5 = 1 Step 1: Write down the problem +5 +5 Step 2:Draw the line through equal sign; Step 3: inverse operation• x = 6 Step 4: Solve the problem (Inverse operation helps to isolate the

variable)

• x + 5 = 11• x + 5 = 11 Step 1: Write down the problem - 5 - 5 Step 2:Draw the line through equal sign;Step 3: inverse operation• x = 6 Step 4: Solve the problem (Inverse operation helps to isolate the

variable)

• x - 2 = 5• x - 2 = 5 Step 1: Write down the problem +2 +2 Step 2:Draw the line through equal sign;Step 3: inverse operation• x = 7 Step 4: Solve the problem (Inverse operation helps to isolate the

variable)

• x - 11 = 6• x - 11 = 6 Step 1: Write down the problem +11 +11 Step 2:Draw the line through equal sign;Step 3: inverse operation• x = 17 Step 4: Solve the problem (Inverse operation helps to isolate

the variable)

1. A

2. B

3. C

4. D

A. 11

B. 13

C. 14

D. 9

Solve m + 9 = 22.

1. A

2. B

3. C

4. D

A. 22

B. 32

C. 30

D. 24

Solve w – 5 = 27.

End of the Lesson