Question

help+medal
Which relation is a function?
A.{(1, 2); (2, 3); (3, 4); (1, 5)}
B.{(1, 2); (2, 5); (3, 2); (4, 5)}
C.{(1, 2); (2, 3); (3, 4); (2, 5)}
D.{(1, 2); (1, 3); (3, 2); (4, 2)}

Answer 1

It's a function if the x elements aren't repeated (y's can be though)

Answer 2

So for example look at D, it has two x's which are similar (1,2) and (1,3) so it's not a function.

Answer 3

Oh I get it, it's B cuz it doesn't have x repeated numbers

Answer 4

@iambatman am i correct?Is B correct?

Answer 5

Yea :)