Answer:
The equation written in a function notation, with x the independent variable is
.
Explanation:
Consider the provided function represented by the equation x - y - 4 = 0
Now convert the provided equation with x the independent variable.

Add both side by y.


The above equation can be written as:

Now the value of y is deeding on the value of x. Where the value of x is independent variable.
Hence, the equation written in a function notation, with x the independent variable is
.