Is (2,3),(-4,5),(-2,7),(7,7) a function?

1 Answer
Monzur R.
Mar 25, 2018

Yes.

Explanation:

If we define a function f:{-4,-2,2,7}->{3,5,7}, such that f(-4)=5,f(-2)=7,f(2)=3,f(7)=7 then f is indeed a function.

We note that f is surjective in this case but not injective. Also, we could pick any number set to be the codomain of f, but this would make f non-surjective.

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