Question 4
Which of the following sets of numbers represents a function?
(1, 2), (2, -3), (3, - 3), (4,5)
(1, 2), (2, 3), (1,3), (4,5)
(-1,- 1),(4, - 1), (1, - 1), ( – 1, - 2)
(2, - 4), (4, - 1), (2, 4), ( – 4, 1)
