r + 3 = 4
r = 1
-13h = 39
h = -3
x + (-3) = 6
x = 9
x + 5 = -18
x = -23
A letter used in place of a number?
What is a variable
n - 2 = 5
n = 7
68 = x - 52
x = 120
b/100 = -400
b = -40,000
Six increased by a number is 40.
6 + n = 40
n = 34
The inverse (opposite) of division.
What is multiply?
3t = 9
t = 3
g/8 = 16
g = 128
-7x = 28
x = -4
15 less than a number is -4
n - 15 = -4
n = 11
A math problem with an equal sign.
What is an equation?
y/2 = 6
y = 12
87 = 30 + p
p = 57
14 + x = -33
x = -47
The difference between a number and 9 is 34.
n - 9 = 34
n = 43
When we do the opposite operation in math.
What is inverse?
d + 6 = 6
d = 0
65 = k - 17
k = 82
-x/9 = -9
x = 81
One half of a number is 84.
1/2n = 84 OR n/2 = 84
n = 168
Getting a letter all alone in an equation.
What is isolate