bantuin aku dong teman... plisssss_ invers teman

[tex]f(x)=17x+18\\ y=17x+18\\ 17x=y-18\\ x= \frac{y-18}{17} \\ f^{-1}(y)= \frac{y-18}{17} \\ f^{-1}(x)= \frac{x-18}{17} \\[/tex]