Consider the function represented by the equation y-x-4=0. what is the equation written in the function notation, with x as thee independent variable?

Function notation is a way of writing equations that has a form:

f(x)=ax+b, where x is the independent variable, f(x) is the output of the function, a and b are constants. 

So if we have an equation: y-x-4=0, first we leave y on the left side and put everything else on the right side:

y=x+4, then we can write it in function notation as:

f(x)=x+4, where f(x) corresponds to y.