The price of a particular snack at a ballpark seems to affect the number sold in a way such that the product of the number
and the price in dollars is roughly constant. The table shows some of the data.

Is the data linear? Why or why not?
a. Yes, it appears on a straight line.
c. There is not enough information to determine
whether this data is linear.
d. Yes, the average rate of change is constant.
b. No, it does not appear on a straight line.