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## Homework Statement

find a formula for f-1 when f is defined by

f(x) = 3x+5/x-4

## Homework Equations

## The Attempt at a Solution

Here is what I've done so far:

First I switch the x and the y so I get

x=3y+5/y-4

x(y-4)=3y+5

xy-4x=3y+5

xy=3y+4x+5

xy-3y=4x+5

y-3y=4x+5/x

-2y=4+5

I don't know what else to do. No matter what I try I always end up deleting a variable.

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