Answer:
all I know is sin square A +cos square A =1
I believe the answer is 2, the 3 large circles are filled with 5 dots each, the total number of dots is 17. 15 is the number closest to 17 that can be divided by 3 therefore there would be 2 left over (the 2 dots on the outside)
It is definitely (y-2)=3(x-2)