Either of (2,2) or (2,3) should be removed to get the relation as a function.
We know that a relation is a function if each element of the first set is mapped to a unique element of the other set.
i.e. corresponding to each x value we have a single y-value.
We are given a relation as:
{(–1, 0), (1, 3), (2, 2), (2, 3), (3, 1)}
As we could observe that there are two images corresponding to '2' i.e. 2 is mapped to 2 and 3 both as could be seen from the ordered pair (2,2) and (2,3).
Hence, if any one of (2,2) and (2,3) will be removed we will get our relation as a function.
