Question

Write an input and output pair that is a function and stays a function when you switch the input and output

Answer 1

9514 1404 393

Answer:

{(1, 2), (3, 4)}

Explanation:

If you want both the relation and its inverse to be functions, there can be no repeated x-values, and no repeated y-values.

In the above pair of points, I have avoided duplicates by making all of the values different. That is not necessary, but it satisfies this problem easily.