When predator populations increase, what happens to the prey population?

Answer: As the prey population increases, there is more food for predators. So, after a slight lag, the predator population increases as well. As the number of predators increases, more prey are captured. As a result, the prey population starts to decrease.

Most likely a decrease in prey population

Explanation:

With the increase of predators there will be an increase of hunting for food, which means a decrease in prey.