Question 634343
{ (13,14), (12,5) , (16,7), (13, 14), (-2, 33), (13, 14 }


is the same as


{ (13,14), (12,5) , (16,7), (-2, 33)}


after you remove all the duplicates


Since each x maps to ONLY ONE y value, this means that this relation is indeed a function. If we had for instance x = 12 mapping to both y = 5 and y = 8 at the same time, then it wouldn't be a function. But that's not the case here.


So this relation <font color="red">is a function</font>.