A letter used to represent an unknown number
What is a variable?
Simplify/Distribute
4(x+2)
4x+8
The inverse of multiplication and addition are
Division and subtraction
Simplify/Distribute
5(2y+3)
10y+15
The four basic operations are...
What are addition, subtraction, multiplication, and division?
39+2r = 65
What is 13 ?
Simplify/Distribute
-4(-2r+3)
8r-12
What do you do to a number outside of the parenthesis? Ex: 2(x+2)=4
Be divided away to the other side of the equation OR be distributed/multiplied with the numbers inside of the parenthesis
27+12s = 171
What is 12 ?
- 71+4j = 29
What is 25 ?
Simplify/Distribute
(-3c-10)3
-9c-30
To move a number from one side of an equation to the other you must...
Do the inverse operation to the number/Do the opposite
314+ 19b = 1663
What is 71 ?
- 39+21q = 234
What is 13 ?
Simplify/Distribute
-2(2c+3d+4)
-4c-6d-8