2'4 Solving Equations: Addition or Subtraction

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2.4 Solving EquationsAddition or Subtraction
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Solving Equations
When you solve an equation, you need to think of
the equation as a scale both sides need to be
balanced and what you do to 1 side has to be done
to the other.
Lets try some examples!
45 31 14
1st ask yourself what is being done to the
variable and do the opposite.
x 31 14
31 31
31 is being subtracted, so add 31 to both sides.
Then, solve each side.
x 45
Check your answer by substituting.
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Solving Equations Continued
x 27 45
m 36 81
27 27
- 36 -36
x 72
m 45
72 27 45
45 36 81
n 23 43
h 18 37
23 23
- 18 -18
n 66
h 19
66 23 43
19 18 37
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Now You Try!
Solve the following equations.
f 34 76
h 124 102
- 34 -34
124 124
f 42
h 226
42 34 76
226 124 102
x 3.4 15
457 k 79
3.4 3.4
-79 - 79
378 k
x 18.4
18.4 3.4 15
457 378 79