with Addition
15 = w + 4
11 = w
y - 7 = 12
y = 19
3b = 21
b = 7
a/7 = 5
a = 35
The number is called the _________ and the letter is called the ___________.
value/variable
w + 2 = 12
w = 10
a - 2 = 10
a = 12
7t = 49
t = 7
34 = y/2
y = 68
A mathematical sentence that contains an equal sign is an _________________.
equation
9 + k = 23
k = 14
s - 4 = 12
s = 16
4x = 24
x = 6
b/4 = 12
b = 48
A ____________________ is a symbol, usually a letter, used to represent an unknown number.
variable
r + 6 = (-10)
r = (-16)
m - 14 = (-2)
m = 12
15h = 75
h = 5
21 = x/3
63 = x
Operations that "undo" each other are called ________________. (think opposite)
inverse operations
-12 = 2 + h
-14 = h
k - 9 = (-11)
k = (-2)
1/3n = 13
n = 39
f/11 = 12
f = 132
The value of the variable that makes the equation true is called the ____________________.
solution (or answer)