Answer:
C
Step-by-step explanation:
swap y and x in the function. that is

we get x=4y+5
<em>S</em><em>o</em><em>l</em><em>v</em><em>e </em><em>for </em><em>y</em>
(x-5)/4=y

If you are looking for how to turn that worded problem into an equation...
Heres the answer you're looking for
3x-11
The answer in simplest form is 1/4.