This is a proportional problem.
The distance 'd' corresponds to the 9 inches.
The 7-ft pin corresponds to the size 's'.
Convert 7ft to 7/3 yds. This way you have equal ratio of yds to inches.
I believe you just add all the numbers then divide by how many were there. You would divide by 16.
the answer to this question is y=2x.
Answer is D.
Because;
The first equation = the second equation