The supply of crude oil is 9.8 billion barrels and the demand is 9.3 billion barrels at a price of $1.94 per barrel. The supply is 9.4 billion barrels and the demand is 9.5 billion barrels at a price of $1.82 per barrel.

(a) Find a price-supply equation of the form

(b)Find a price-demand equation of the form

(c) Use algebra to find the equilibrium supply and the equilibrium price, labeling each.

(d) At a price of $1.90 per barrel, is there a surplus of supply or a shortage of supply? Show all work to support your answer. Write your answer in a complete sentence.