Addition
3 + a = 8
a = 5
a - 5 = 4
9
5a = 25
5
a/9 =9
81
8 + a = 12
a = 4
a - 10 = 13
23
In an equation, what are you trying to do to the variable?
Isolate the variable/ get it by itself
25 x a = 625
25
a/7=4
28
21 + a = 26
5
a-10 = 8
True or False: If you add 3 to one side of an equation, you don't need to add it to the other side.
FALSE!
18a = 486
27
a/10=4
40
a + 20 = 30
10
a - 15= 15
30
What is the inverse of addition?
subtraction
17 x a = 34
2
k ÷ 3 = 11
a + 52 = 106
54
a - 248 = 700
948
What is the inverse of division?
multiplication
-8a = -24
3
a ÷ 50 = 100
5,000