SOLUTION: Is the relation a function? Why or why not? {(-1, 1), (-2, 1), (-2, 2), (0, 2)}

Question 1040294: Is the relation a function? Why or why not?
{(-1, 1), (-2, 1), (-2, 2), (0, 2)}
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!

No it isn't, because (-2, 1) and (-2, 2) have the same FIRST 
coordinate -2.

[It doesn't matter that some have the same SECOND coordinate.
It's only more than one point with the same FIRST coordinate 
that prevents a set of ordered pairs from being a function.]

Edwin

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