Take a more clear picture then I will help you
Answer:
Step-by-step explanation:
In order to write the equation of this line, we need to pick 2 points on the graph where the line goes right through the intersection of the grids. Actually, you only need 1 of these, because the line goes through at (0, 15). Another point then can be (6, 6). Locate this point so you know what I means when I say that the line goes right through where the grids intersect at x = 6 and y = 6 (as opposed to somewhere in the middle of one of these grids). Find the slope between these 2 points:

Since there's only one choice with that slope, that is the choice you want.
F(x) = -9/x
f(6) = -9/6
f(6) = -3/2
f(6) = -1.5
The function of f(x) = -9 / x at x = 6 is equal to -3 / 2 or -1.5.
Hope that helps!
The answer is (-7,3). Hope it helps. Tell me if you need the whole work or if I'm wrong.