Question

Select the relations that are functions.

{(a, 1), (b, 1), (c, 1)}{(a, a), (a, b), (a, c)}{(1, a), (2, a), (3, a)}{(a, a), (b, b), (c, c)}

Answer 1

For a relationship to be a function the value (x) can have only one value for (y).