Expressions

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Plugging in a number for a variable is called

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Substitution

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What is an expression in mathematics?

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A combination of numbers, variables, and operators (like +, -, *, /) that represents a value.

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What is a variable?

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A symbol (like x or y) that represents an unknown value.

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What does it mean to evaluate an expression?

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To calculate the value of the expression by substituting numbers for the variables.

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What is the order of operations?

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The rules that determine the sequence in which operations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

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