Question

On analyzing a function, John finds that f(3)=7. This means that the graph of f passes through the point

Answer 1

f(x) = some function

so for example, let's say that our equation is
f(x) = 5x

if we plug in x = 4, how does that look?
f(4) = 5*4
f(4) = 20

What is the y-value when x=4?
It's 20 because f(x) is basically the y

Answer 2

So f(3) = 7

what is the x-value?
what is the y-value?

and remember, points are written like (x, y)