Answer:
I agree it's exponential, but it's so much simpler than you guys make it out to be. An easy way to check is to measure the distance in the x and y values to see if they change at a constant rate.
for instance; 1) abs(0-3) =3 95-69= 26
2) abs(3-6) = 3 59-50= 19 ...
It's easier, faster, and less to memorize