17.2 On the island of Majorca there are 2 lakes and 20 anglers.

Each angler can fish on either lake and keep the average catch on his particular lake. On Lake x, the total number of fish caught is given by F x = 10lx − 1 2

l 2 x, where lx is the number of people fishing on the lake. For Lake y, the relationship is F y = 5ly.

a.

b.

c.

d.