Explanation:
Don't let f(x) confuse you, f(x) just means y. With this they are just wanting you to randomly input an x value. I'll use the number 1, to show you an example.
f(x) = 4/x - 3
f(1) = 4/1 - 3
f(1) = 4 - 3
f(1) = 1
So for this point you would put (1,1). Which is 1 unit to the right, and 1 unit up.
Horizontal line = x values
Vertical line = y values
Hope this helps! Let me know if you need something else! :)