Expressions with Variables

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What is a variable in mathematics?

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A variable is a symbol, often a letter, that represents a number that can change or vary.

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What is an expression?

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An expression is a combination of numbers, variables, and operations (like addition or multiplication) that represents a value.

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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 specific numbers.

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What is the difference between an equation and an expression?

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An equation states that two expressions are equal, while an expression does not include an equality sign.

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Can an expression have more than one variable?

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What is a coefficient?

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What is a constant?

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How do you solve for a variable in an equation?

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To solve for a variable, you isolate it on one side of the equation using inverse operations.

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