The inverse of function f(x) = (2x - 1)/(x - 8) is written in the form of $f^{-1}(x) = (ax + b)/(c + d)$, where a, b, c, and d are all real numbers. Find a/c.

a/c = 4.

I think the question contains a typo: $f^{-1}(x)$ should have the form $(ax+b)/(cx+d)$ instead.