Evaluating Algebraic Expressions Given a Variable

An expression that contains one or more variables and may also contain operation symbols, is called an

• algebraic expression

• numerical expression

• facial expression

• x divided by 7

• 7 divided by x

• x minus 7

• 7 added to x

• c minus 5

• 5 less than c

• c increased by 5

• half of c

• y minus 10

• y take away 10

• 10 less than y

• all of the above are correct phrases for the expression

A variable is a letter or symbol used to represent an unknown number.

• True

• False

Evaluate each expression for the given value of the variable.

a + 6; a = 2

Evaluate each expression for the given value of the variable.

7(m - 6); m = 8

Evaluate each expression for the given value of the variable.

7m - 6; m = 8

Evaluate each expression for the given values of the variables.

s - k + x; s = 7, k = 4, x = 6

A _____________ is a symbol, usually a letter that stands for a number.

• constant

• variable

• algebraic expression