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

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Answer 1 · 2015-06-13T03:42:21

Yes. It is a function.

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

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

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

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