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Explain the difference between a function and a relation

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Explain the difference between a function and a relation. Consider the equation x2 + y2 = 5 and explain why you believe it's a function or not? Give at least two reasons to support your answer.

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A relation is any set of 2-variable pairs, independent and dependent, or an equation that shows how the dependent variable relates to the independent variable. A function is also a relation, but it has a unique description that separates it from any other relation. A function is a case ...

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