Question

Which of the following relations is a function?

A.
(1, 4), (-3, 6), (1, 3), (-7, 2)

B.
(1, 0), (-3, 3), (7, 1), (-3, 5)

C.
(1, 4), (-3, 2), (7, 1), (-7, 2)

D.
(7, 1), (-3, 4), (1, 1), (7, 2)
this is study island understanding functions

Answer 1

C is the correct answer.

Explanation:

Look at the X values for each coordinate pair. If an X value is represented twice with different Y values, it is not a function. If no X value is repeated, or it is repeated but has the same Y value, then it is a function. A has two values for x = 1, B has two values for x = -3, D has two values for x = 7, but C does not, so it is the correct answer.