Answer :
The function for is:
[tex]y=f(x)[/tex]A function is a process or a relation that associates each element x to a single element y. x is the independent variable and y is the dependent variable. Normally if you write a function, you isolate the dependent variable.
[tex]x=4y+3[/tex]This function is not in function form, as you can see the dependent variable y isn't isolated. A correct way would be:
[tex]y=\frac{x-3}{4}[/tex]