Suppose the demand and supply are given by Qdx = 14 - 1/2 Px and Qyx = 1/4 Px - 1 a. Determine the equilibrium price and quantity. Show the equilibrium graphically. b. Suppose a $12 excise tax is imposed on the good. Determine the new equilibrium price and quantity. Please show all work so I can understand. c. How much tax revenue does the government earn with the $12 tax? Please show all steps, so I can understand.