The demand for a product is Qd=100-4P-3Px and supply is Qs=10+2P, where Q is the quantity of the product, in thousands of units, P is the price of the product, and Px is the price of another good.
1. When Px = $20, what is the equilibrium price and quantity sold of the product?
2) At the equilibrium price and quantity, what is the own price elasticity of demand for the product?
3) What is the cross-price elasticity of demand for the product at the equilibrium price and quantity?
4) Does the cross-price elasticity provide enough information to determine whether the product and good X are complements or substitutes? If Yes, are they complements or substitutes? If No, why not?