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jcherry99
A table of values is not going to be a function if two y values have the same x value. 

If you run a vertical line through the x and get 2 y values, you are not dealing with a function. The one that does that is D. You have 3 and the two y values for x = 3. Those two y values are -4 and 0.
In a function, each input or x value can have only one output or y value. For instance, when x = 10, y can't equal both 5 and 1. That would be one input producing multiple outputs. Look at answer choice D. See how the x-value of 3 has TWO corresponding y-values? Therefore, that's NOT a function.

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