4. Use the graph below to answer the questions. Price (dollars) D Quantity a. A change in quantity demanded is represented by a change from equilibrium point X to equilibrium point b. A change in demand is represented by a change from equilibrium point V to equilibrium point c. A change in quantity supplied is represented by a change from equilibrium point W to equilibrium point d. A change in supply is represented by a change from equilibrium point Z to equilibrium point