SOLUTION: why this is not a fuction(0,-11),(1,2),(3,4),(3,9),(7,0)}

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Question 454584: why this is not a fuction(0,-11),(1,2),(3,4),(3,9),(7,0)}
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Because the pair of points (3,4) and (3,9) have the same first coordinates.