Algebra: a language of symbols including variables

Variable: a symbol, usually a letter, used to represent a number.

Evaluate One-Step Expressions

Algebraic expressions contain at least one variable and at least one operation.

The letter X is often used as a variable. To avoid confusion with the symbol x, there are other ways to show multiplication

Examples

• Evaluate 16 + b if b = 25.

• Evaluate x-y if x=64 and y=27.

• Evaluate 6x if x=1/2

Evaluate Multi-Step Expressions

To evaluate multi-step expressions, replace each variable with the correct value and follow the order of operations.

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