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Solving Addition and Subtraction Equations

- Lesson 2-6

Procedure

- Isolate the variable by performing the inverse

operation on that variable. - The inverse of subtraction is adding. The

inverse of adding is subtracting. - Perform the same operation on the side of the

equal sign that does not have a variable.

Example

We want to get the y by itself. Perform the

inverse operation. The inverse of adding is

subtracting.

y 13 25

- 13

- 13

Do the same operation on the other side of the

equal sign.

y 12

Check the answer in the original equation.

y 13 25

12 13 25

25 25

Example 2

To get k by itself, we perform the inverse

operation. The opposite of minus 12 is plus

12.

k 12 4

12

12

k 16

Check

k 12 4

16 12 4

4 4

Homework Time

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