Equations
Solve: 12 = 8 + a
show your work
12 = 8 + a
-8 -8
4 = a
The letter in the equation is called?
Variable
Solve: 15 = 9 + x
show your work
15 = 9 + x
-9 -9
x = 6
Solve: 98 + p = 56
Show your work
* Hint: remember we can have (+) and (-) numbers
98 + p = 56
-98 -98
p = -42
Solve: 31 = t + 19
show your work
31 = t + 19
-19 -19
12 = t
Isolate
Solve: d + 9 = 14
show your work
d + 9 = 14
-9 -9
d = 5
Solve: x + 69 = 166
Show your work
x + 69 = 166
-69 -69
x = 97
Solve: m + 13 = 31
show your work
m + 13 = 31
-13 -13
m = 18
For one-step addition equations, we have to ___ on both sides.
Solve: 12 = j + 6
show your work
12 = j + 6
-6 -6
j = 6
Solve: v - 76 = 2
Show your work
v - 76 = 2
+76 +76
v = 78
Solve: 12 + v = 27
show your work
12 + v = 27
-12 -12
v = 15
What is a variable?
A variable is an unknown number.
Solve: h + 7 = 15
show your work
h + 7 = 15
-7 -7
h = 8
Solve: 58 + m = 54
Show your work
* Hint: remember we can have (+) and (-) numbers
58 + m = 54
-58 -58
m = -4
Solve: 21 = g + 10
show your work
21 = g + 10
-10 -10
g = 11
6 + m = 8, to solve this we need to use the ____ or _____ operation.
Inverse or oposite
Solve: 10 = 3 + b
show your work
10 = 3 + b
-3 -3
b = 7
Solve: 70 = 11 + k
Show your work
70 = 11 + k
-11 -11
k = 59