Answer:
see explanation
Explanation:
The domain D are the values of x, that is
D = { 3, 6, 12, 18 }
The range R are the values of y , that is
R = { 5, 7, 9, 10 }
The relationship is a function if each value of x in the domain maps to exactly one unique value of y in the range.
The relation is not a function as
6 → 5 and 6 → 10 ( that is 2 different values )