First, let's plug the information we have into the equation.
x + 9 = 3
Next, you would have to do is isolate the x. To do this, you would subtract both sides by 9.
x + 9 = 3
x = -6
So, this is what we know.
y = 9
x = -6
Now, all you would have to do is change them into coordinates. (x,y)
(-6,9)
Your answer would be B. (-6,9).
I hope this helps!