The demand and supply functions of goods 1 and goods 2 are as follows. Demand function Qd1=18-4P1+2P2 Qaz 13P1-3P2 Supply function Qs1-3+2P1 - P2 Qs2=-1-2P1+6P2 a. Determine the market equilibrium price and quantity for both types of goods! b. Do goods 1 and goods 2 have a complementary or substitution relationship? Give one example to support your explanation