Question

This set of ordered pairs (x,y) defines a relation:
{(−4,1),(1,3),(3,1),(3,6)}
Which best explains why this relation is NOT a function?
A.

(−4,1) has a negative x-value.
B.

(−4,1) and (3,1) have the same y-value but different x-values.
C.

(3,1) and (3,6) have the same x-value but different y-values.
D.

(1,3) has a positive y-value.

Answer 1

C. (3,1) and (3,6) have the same x-value but different y-values — the input 3 corresponds to two different outputs, so the relation is not a function.