Question 983940
The question by itself is wrong.  y is a variable and a number.  f(x) is a function or the name of a function and a dependent variable.  y can be a dependent variable too, if it is expected to be; or it can be an indepenent variable if the person using it means it to have this purpose.


The question can be made right if attention is on a variable y and if y is being assinged to a function.


y=mx+b
Equation with (usually) two unknown variables, x and y.  Each variable depends on the other.


f(x)=mx+b
Function f defined according to the expression, mx+b.  As written, f depends on x.