Topic 3 - Equivalent Expressions and Evaluating Expressions

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What is an equivalent expression?

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An equivalent expression is an expression that has the same value as another expression for all values of the variable(s) involved.

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What are variables in an expression?

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Variables are symbols (usually letters) that represent unknown values in mathematical expressions.

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Yes

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The coefficient is 5, which is the number multiplying the variable x.

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What does it mean to evaluate an expression?

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To evaluate an expression means to calculate its value by substituting the variables with numbers.

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