SOLVING EQUATIONS BY
ADDING
VOCABULARY
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Equations – a mathematical sentence with
an equal sign. Each side of the equal sign
will have the same value.
Inverse Operations – operations that undo
each other. For example, subtraction will
undo addition.
SOLVING EQUATIONS
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When you solve equations, your goal is to
get the variable alone on one side of the
equation with everything else on the other
side.
To make that happen, you must use inverse
operations.
The opposite of addition is subtraction
Example 1
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x + 6 = 10
Since there is a + 6 on the side of the variable, we
must use inverse operations to get rid of it.
x + 6 = 10
=- 6
x =
4
CHECKING TIME
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When you’re finished with your problem,
go back and check!
x + 6 = 10
Since we know that x = 4, replace the x
with 4
4 + 6 = 10
10 = 10
NOTE
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Whenever the original problem shows
addition, use subtraction to get rid of the
numbers.
Only subtract the number that is on the side
of the variable.