Question

Which relation is a function?

1.{(1, 2); (2, 3); (3, 4); (1, 5)}     
2.{(1, 2); (1, 3); (1, 4); (1, 5)}       
3.{(1, 2); (2, 3); (3, 4); (2, 5)}       
4.{(1, 2); (2, 2); (3, 2); (4, 2)}

Answer 1

choice 4 and that is so because it is only a function when the x values are non-repeating

Answer 2

We may say the fourth one, as the function would be this:

\( \color{Black}{\Rightarrow f(x) = 2 }\)

Answer 3

Thank You :D