Question

The mapping shows a relationship between input and output values.

A mapping diagram shows a relation, using arrows, between input and output for the following ordered pairs: (negative 5, 0), (2, negative 3), (negative 1, negative 3), (4, negative 2), (4, 2), (6, negative 1).
Which ordered pair could be removed to make this relation a function?

(–5, 0)
(–1, –3)
(4, –2)
(6, –1)

Answer 1

(4, –2)

Removing that pair leaves only one output (2) for input 4, so each input corresponds to exactly one output and the relation is a function.