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## Solve one - step equations using subtraction.

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Credit: Sumeet Jain

#### Example 2

First, identify the number that is being added to the variable, in this case, 15.

Next, using the inverse of 15, subtract 15 from both sides of the equation.

Finally, check your answer by plugging 17 in the equation for .

#### Example 3

First, identify the number that is being added to the variable, in this case, 16.

Next, using the inverse of 16, subtract 16 from both sides of the equation.

Finally, check your answer by plugging 6 in the equation for .

#### Example 4

First, identify the number that is being added to the variable, in this case, 15.

Next, using the inverse of 15, subtract 15 from both sides of the equation.

Finally, check your answer by plugging 15 in the equation for .

#### Example 5

First, identify the number that is being added to the variable, in this case, 12.

Next, using the inverse of 15, subtract 15 from both sides of the equation.

Finally, check your answer by plugging 6 in the equation for .

### Review

To see the Review answers, open this PDF file and look for section 12.5.

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Color Highlighted Text Notes

### Vocabulary Language: English

Difference

The result of a subtraction operation is called a difference.

Expression

An expression is a mathematical phrase containing variables, operations and/or numbers. Expressions do not include comparative operators such as equal signs or inequality symbols.

Inverse

Inverse operations are operations that "undo" each other. Multiplication is the inverse operation of division. Addition is the inverse operation of subtraction.

Simplify

To simplify means to rewrite an expression to make it as "simple" as possible. You can simplify by removing parentheses, combining like terms, or reducing fractions.

Sum

The sum is the result after two or more amounts have been added together.