For the Pair of Supply-And-Demand Equations, Where X Represents the Quantity

Multiple Choice

For the pair of supply-and-demand equations, where x represents the quantity demanded in units of 1,000 and p is the unit price in dollars, find the equilibrium quantity and the equilibrium price. p = - 2x + 15 and p = 5x + 1

A) equilibrium quantity 4,000 units; equilibrium price $9
B) equilibrium quantity 4,000 units; equilibrium price $11
C) equilibrium quantity 2,000 units; equilibrium price $9
D) equilibrium quantity 2,000 units; equilibrium price $11