Is the relation {(1, 1), (-1, 1), (2, 4), (-2, 4)} a function?

Jun 13, 2015

Answer:

Yes. It is a function.

Explanation:

A relation fails to be a function if and only if there are 2 pairs with the same $x$ and different $y$'s.

That c is not happen in your question, do it is a function.

(It us not a one-to-one function.)