4. Solve the following system of equations (10 points). 50+20=1800 10+3=300

5. Consider the demand and supply functions for the notebooks market. (20 Points). =10,000100 =900 a. Make a table with the corresponding supply and demand schedule. b. Draw the corresponding graph. c. Is it possible to find the price and quantity of equilibrium with the graph method? d. Find the price and quantity of equilibrium by solving the system of equations.

6. Supply and demand functions show different relationship between the price and quantities supplied and demanded. Explain the reason for that relation. (15 points).