Question

Which of the following sets represents a function?

A) {(3, 5), (-1, 7), (3, 9)}
B) {(1, 2), (3, 2), (5, 7)}
C) {(1, 2), (1, 4), (1, 6)}

Answer 1

B represents a function because the x-value isn't repeating. When the x-value repeats its not a function but if the y-value repeats it is a function.