Vocabulary
to get the letter all by itself
isolate the variable
d + 5 = 12
d = 7
19.3 + m = 22.7
m = 3.4
j / 4 = 3/8
j = 1 1/2
To solve an addition equation, you...
subtract.
operations that undo each other
inverse operations
70 = h + 3
h = 67
v - 1.29 = 3.92
v = 5.21
3 1/2 + c = 8
c = 4 1/2
To solve a division equation, you...
multiply.
a math sentence that shows two amounts are equal
equation
12 = x / 2
x = 24
6.2 = x / 5.8
x = 35.96
x = 1/20
The reason we add/subtract/multiply/divide from both sides of the equation.
To keep the equation equal or balanced (like a scale)
the value for a variable that makes the equation true
solution
56 = 8x
x = 7
30.09 = s - 29.97
s = 60.06
12 1/2 = m - 9
m = 3 1/2
The reason we add/subtract/multiply/divide the number that is on the side of the equation with the variable.
To isolate the variable.
a math phrase that has numbers, variables, and operations
expression
x/10 = 9
x = 90
68.8 = 4k
k = 17.2
3/4d = 12
This makes equations different from expressions.
Equations have one solution and an equal sign.