Each element $$x$$ from the domain $$\mathbb{X} = \{ 1, 5, 3, 6 \}$$ is assigned an element $$y$$ from the codomain $$\mathbb{Y} = \{ 4, 3, 2, 10, 42 \}$$ as an example. This results in the following function rule:$f(1) = 10$ $f(5) = 10$ $f(3) = 42$ $f(6) = 2$