### Instruction: What is the inverse of $f(x)=4-5x$?### Response: Let's first write $f(x)=4-5x$ in the form of $x=...$
So if we add 5x to both sides we get $5x+f(x)=4$.
And if we subtract f(x) from both sides we get $5x=4-f(x)$.
Now if we divide both sides by 5 we get $x=(4-f(x))/5$.