Question

Consider the function represented by with x as the independent variable. How can this function be written using function notation?

Answer 1

If the dependent variable is y and the independent variable is x, write y as a function of x:
f(x) = y
(or equivalently y = f(x)).

If you have an explicit rule, replace y with that rule; e.g. if y = x^2 + 1 then f(x) = x^2 + 1.