Variables on both sides
− 3 + 5a = 4a − 10
a = -7
a + 3 = 8
5
2(9)=
18
What is a variable?
A place holder for an unknown number
Whats my name.
Mr Gonzalez
1 - 3x = 3x + 1
x = 0
a - 15 = 15
30
2(x+7)=22
X=4
Define inverse
The opposite, signs that undo each other
What is my favorite color?
Black
n - 2 = 4n +1
n = -1
8x = 56
7
4(3d-2) = 20
1
Give me an example of a variable
Any letter
What room are we in?
teacher knows
1 - x = 16 - 4x
x = 5
a/12 = 4
48
Double points
Who is batman
Bruce Wayne
What is the inverse operation of addition?
Subtract
Whats my favorite Movie
teacher knows
4r + 8 + 5 = −15 − 3r
r = -4
a + 30 = 120
90
- 7 - 2x = 7 (x + 8)
x = -7
What can you do to check your answer when solving?
Plug your answer in
How old am I?
teacher response