A section of the Yellowstone national park had the population of deer on the high rise.
Some wolves were introduced to balance the ecosystem. The situation is modeled by the
equation 1500x + 2y = 31000, where x is the number of years and y is the total
population of deer. Which is the rate of change of the population of the deer?
A -750 per year
B 750 per year
C -1500 per year
D 1500 per year
