Question

select the relations that are functions.
{(a, 1), (b, 1), (c, 1)}
{(a, a), (a, b), (a, c)}
{(1, a), (2, a), (3, a)}
{(a, a), (b, b), (c, c)}

Answer 1

all you need to do is make sure the x value does not repeat. which ones does an x value repeat?

Answer 2

remove that one and the three left are your answers

Answer 3

Oh, thanks :)

Answer 4

which one did you remove?