Question

Which of the following relations is a function? {A. (1, 2), (1, 3), (2, 8), (3, 9) } B.{ (1, 2), (2, 3), (3, 4), (4, 5) } C.{ (3, -1), (2, 3), (3, 4), (1, 7) } D.{ (3, 0), (4, -3), (6, 7), (4, 4) }

Answer 1

A function will have different x values in each ordered pair.
so A is not a function because of the 1's in (1,2) and (1,3)

B is a function

Answer 2

The answer is B.{ (1, 2), (2, 3), (3, 4), (4, 5) }