Question

On a coordinate plane, solid circles appear at the following points: (negative 4, 2), (negative 2, 2), (negative 1, 4), (1, 1), (1, 3), (2, negative 3).
Which ordered pair could be removed from the graph to create a set of ordered pairs that represents a function?

(–4, 2)
(–1, 4)
(1, 3)
(2, –3)

Answer 1

(1, 3)

Reason: A relation is a function if each x-value appears only once. Right now x = 1 corresponds to two y-values (1 and 3). Removing (1, 3) leaves each x with a single y.