Match each function with the expression representing its inverse function.
1. y = x-4
2. g(x) = -0.5x
3. k(x) = x
4. p(x) = x + 4
5. h(x) = 4x
6. ƒ(x) = x/2

Choices:
2x
-2x
0.25x
x
x-4
x+4