A manufacturer sells aardvark masks at a price of $280 per mask and butterfly masks at a price of $590 per mask. A quantity of
a
aardvark masks and
b
butterfly masks is sold at a total cost of $600 to the manufacturer.
(a) Express the manufacturer's profit,
P
, as a function of
a
and
b
.
dollars.
(b) The curves of constant profit in the ab-plane are
A.
circles
B.
ellipses
C.
hyperbolas
D.
parabolas
E.
lines