Question

Which of the following sets of ordered pairs is a function?

A: (2,1),(2,2),(3.4),(5,6)
B:(-2,-1),(1,2),(3,4),(1,5)
C:(1,2),(2,2),(3,3),(2,4)
D: (1,1),(2,1),(3,2),(4,4)

Answer 1

it would be D

Explanation:

all other choices have a repeating x value.