# Pre Algebra Assignment Simplify Each Expression

A variable is a letter, for example x, y or z, that represents an unspecified number.

$$6+x=12$$

To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12.

If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.

Example

Calculate the following expression for x=3 and z=2

$$6z+4x=\: ?$$

Solution: Replace x with 3 and z with 2 to evaluate the expression.

$$6z+4x=\: ?$$

$$6\cdot {\color{blue} 2}+ 4\cdot {\color{blue} 3}=?$$

$$\: \, 12+12=24$$

## Video lesson

Evaluate the following expression for x = 2, y = 5 and z = 4

$$4x+(7-z)-6y$$

## Algebraic Expressions Worksheets

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## Detailed Description for All Algebraic Expressions Worksheets

Words to Algebraic Expressions
These Algebraic Expressions Worksheets will produce a great handout to help students learn the symbols for different words and phrases in word problems. These Algebraic Expressions Worksheets are a good resource for students in the 5th Grade through the 8th Grade.

Translate Phrases Worksheets
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Simplifying Variables Expressions Worksheets
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The Distributive Property Worksheets
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Evaluating One Variable Expressions Worksheets
These Algebraic Expressions Worksheets will create algebraic statements with one variable for the student to evaluate. You may select from 2, 3 and 4 terms with addition, subtraction, multiplication, and division. These Algebraic Expressions Worksheets are a good resource for students in the 5th Grade through the 8th Grade.

Evaluating Two Variables Expressions Worksheets
These Algebraic Expressions Worksheets will create algebraic statements with two variables for the student to evaluate. You may select from 2, 3 and 4 terms with addition, subtraction, multiplication, and division. These Algebraic Expressions Worksheets are a good resource for students in the 5th Grade through the 8th Grade.