Question 388506
{{{y=4/(x-7)}}}
Interchange x and y and solve for y.
{{{x=4/(y-7)}}}
{{{x(y-7)=4}}}
{{{xy-7x=4}}}
{{{xy=7x+4}}}
{{{y=(7x+4)/x}}}
{{{highlight(f^(-1)=(7x+4)/x)}}}