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Determine whether the points on this graph represent a function.

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Now just as a refresher a function is

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really just an association between members of a set that we call

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the domain and members of a set that we call a range.

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So if I take any member of the domain, lets call that x, and I give it to the function,

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the function should tell me

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what member of my range is that associated with it.

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So it should point to some other value. This is a function.

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It would not be a function if it says "Well, it could point to y

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or

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it could point to z.

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Or maybe it could point to e.

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Or whatever else. This would not be a function.

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Because over here, so this right over here is not a function. Because it's not clear if you

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input x, what member of the range are you going to get?