SOLUTION: Is [(1,1), (2,1), (2,2) an (1,2)] a function?

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Question 469782: Is [(1,1), (2,1), (2,2) an (1,2)] a function?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
No, because the x-coordinate of 1 is paired with the y-coordinates 1 and 2. You can't have a function that has one input mapping to 2 different outputs. So it's not a function.