Question

pomogite. druzya please

Answer 1

$f(x)=frac{ax+b}{cx+d}, \ x=frac{af^{-1}(x)+b}{cf^{-1}(x)+d}, \ x(cf^{-1}(x)+d)=af^{-1}(x)+b, \ cxf^{-1}(x)+dx=af^{-1}(x)+b, \ cxf^{-1}(x)-af^{-1}(x)=b-dx, \ f^{-1}(x)(cx-a)=-dx+b, \ f^{-1}(x)=frac{-dx+b}{cx-a}.$