Find the domain and range of the relation, and state whether or not the relation is a function.

Question

{(3, 9), (3, 10), (3, 11), (3, 12)}

Answer 1

the domain is the set of first elements, the range is the set of second elements, so the domain is
{3} and the range is {9,10,11,12}

Answer 2

Find the domain and range of the relation, and state whether or not the relation is a function.
{(3, 9), (3, 10), (3, 11), (3, 12)}