Inverse functies

\(
\eqalign{
  & y = \frac{{ax + b}}
{{cx + d}}  \cr
  & y(cx + d) = ax + b  \cr
  & cxy + dy = ax + b  \cr
  & cxy - ax =  - dy + b  \cr
  & x(cy - a) =  - dy + b  \cr
  & x = \frac{{ - dy + b}}
{{cy - a}} \cr}
\)

---

• Inverse functies