What makes a rule a function?

• A rule is a function if any number on the input side corresponds to exactly one number on the output side. • A function is a rule where you know what the output would be if you know the input.

¨A rule is a function if every number on the input side goes to exactly one number on the output side. • A function is a rule where, if you know the input, you know what the output is going to be.¨

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step-by-step explanation:

it's the only multiple of both and the least