Question

Can someone please help

Answer 1

at least we can try..so please post the question.

Answer 2

You are just confused by notation it seems

Hope this explanation helps

Take the function (or equation):

3x + 4 = f(x) = y

First Note that f(x) is just another way of writing y you have probably seen (3x +4 = y), it gives out points as (x, y), f(x) is more descriptive because you can write f(3) or any other value and that equates to a specific point in the function, without actually having to specifically solve for x =3 in the function (or equation). It also makes it easier to refer to different functions, for example you can classify one function as g(x) and another function as f(x).

if x = 4

f(4) = 3(4) + 4 = 16

thus y = 16 = f(4)

you get the point

(4, 16)

When you see x = 5, that just means that it wants the point (5, y) or (5, f(4)), so you would solve for y or f(x) or in this specific case f(5), remember y is the exact same thing as saying f(x), the only difference is f(x) conveys more information about what function you are talking about.