Question

PLATO:
can somebody please help me;

For which function is f(x) equal to f-1(x)?

Answer 1

C.) x = (y+1)/(y-1)

xy-x = y + 1

xy - y) = x + 1

y(x-1) = x+1

y = (x+1)/(x-1) ⇐ this is f-1(x) and it's identical to f(x).