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When looking at an equation how do you know if it is a function?

When looking at an equation how do you know if it is a function?
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When looking at an equation how do you know if it is a function?

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User Girish Hosamani
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When you are given an equation and a specific value for x, there should only be one corresponding y-value for that x-value. For example, y = x + 1 is a function because y will always be one greater than x.
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User CHANDRA
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