Question

Which of the following relations is a function?

Answer 1

a.

{(2, 4), (-3, 2), (2, 9), (1, 4)}
b.

{(1, 2), (6, -2), (6, 0), (-2, 6)}
c.

{(-3, 2), (4, -1), (5, 2), (-2, 4)}
d.

{(2, -2), (-4, 3), (-2, 4), (-2, 3)}