The consumer of a bottle is willing to pay $18 for 3000 bottles but for every $8 decrease they are willing to buy 9000 more bottles. the suppliers will not supply any bottles at a price of $6 per bottle, but are willing to sell 3000 bottles for a unit price of $10. The supply and demand are linear.
a) find the demand equation
b) find the supply equation
c) find equilibrium