Both of these are linear functions:
Distance A is d=2.5h and is proportional to time because the distance is just 2.5 times however many hours you have traveled.
Distance B is d= 2(h-1) + 4. This is not proportional to time but it is a linear function.
See attachment
the midpoint is the point that is in the middle of the segment
4x + 18 = 82
4x = 64
x = 16
The price of each game was $16