Vocabulary
What is a variable?
A letter or symbol that stands for a number we don't know yet.
17+k=31
14
x - 4 = 10
14
x ÷ 4 = 3
12
3x = 12
4
What is a constant?
A number that always stays the same.
r+19=72
53
x - 3 = 7
10
x ÷ 2 = 5
10
4x = 20
5
An operation that does the opposite of another
Inverse operation
x + 3 = 9
6
x - 9 = 20
29
x ÷ 5 = 9
45
5x = 25
5
To get the variable all by itself on one side of the equation is called what?
isolate
x + 25 = 140
115
x - 15 = 12
27
: x ÷ 8 = 6
48
7x =63
A number that is multiplied by a variable is called what?
coefficient
213+y=361
148
x - 50 = 1257
1307
x ÷ 12 = 11
132
12x=108
9