Vocabulary
A letter that represents an unknown number
Variable
5x - 3x + 6
2x + 6
2(2x + 5)
4x + 10
6x = 24
x = 4
2x + 14 = 5 + 5x
x=3
A number multiplied by a variable
(Like the 7 in 7x)
Coefficient
14x - 5 + 6
14x + 1
-3(6x + 5)
-18x - 15
-5x = 30
x = -6
2x - 1 = -16 + 5x
x = 5
A mathemetical phrase that contains numbers, variables, or both, and has an equal sign.
Equation
23 - 12x - 3 + 5x
20 - 7x
3(-4x - 4)
-12x - 12
24 = 2 + 6x - 8
x = 5
3 + 7(x - 8) = -4x - 31
x = 2
A part of an expression that is separated by + or -
Term
6x - 7x + 4 + 9 - x
-2x + 13
-(3x + 7)
-3x - 7
91 = 5(x + 5) + 6x
x = 6
34 - 5x = -7 - 8(5x + 8)
x = -3
A mathemetical phrase that contains numbers, variables, or both, but does not have an equal sign.
Expression
-x - 2 + 5x + 2 - 6x
-2x
-4(7x + 6 + x)
-32x - 24
163 = 6(4x - 6) + 7
x = 8
2(2x + 3) = -6(x + 2) + 7x
x = -6