Vocabulary
the name for the unknown number that is represented with a letter
variable or pronumeral
2x + 5x
7x
3x + 9 = 30
x = 7
2(4x + 2)
8x + 4
x - 7 = 10
x = 17
the name for a number whose value will always remain the same (no variable)
constant
2x - 5x
-3x
4(2x-5) = 60
x = 10
7(-9 + 3x)
-63 + 21x
x = 15
the number in front of a variable in a variable term
EX: 5x (what is the 5 called?)
co-efficient
2x + 5x - 11x
-4x
x/3 + 5 = 20
x = 45
-4(9y - 5)
-36y + 20
x + 11 = 0
x = -11
Numbers, symbols and operations (such as + and ×) grouped together that represent the value of something
expression
y x 14z
14yz
3x + 10 = 2x
x = -10
x(2y - 14)
2xy - 14x
9 + y = 30
y = 21
A mathematical expression that shows the value of the expression using an equal sign
equation
4z x 3y
12yz
13x - 8 = 9x +4
x = 3
-5(2x - 11y + 20)
-10x + 55y - 100
40 = y / 2
y = 80