Supply and demand: The quantity S of barley, in billions of bushels, that barley suppliers in a certain country are willing to produce in a year and offer for sale at a price P , in dollars per...

Supply and demand: The quantity S of barley, in billions of bushels, that barley suppliers in a certain country are willing to produce in a year and offer for sale at a price P , in dollars per bushel, is determined by the relation

P = 1.9S − 0.7 .

The quantity D of barley, in billions of bushels, that barley consumers are willing to purchase in a year at price P is determined by the relation

P = 2.8 − 0.6D .

The equilibrium price is the price at which the quantity supplied is the same as the quantity demanded. Find the equilibrium price for barley.