Can someone show me how to draw adiagram to illustrate the answer. Is the solution correct?

3) (40 marks) Suppose that the market for cigarettes is a competitive market and is described by the following supply and demand functions: Demand: QD = 100000 - 500P Supply: = -20000 + 2000P Where Q is the number of packets and P is the price per packet of cigarettes. (a) (6 marks) Calculate the equilibrium price and quantity and draw a diagram to illustrate your answer. Answer: = IOOOOO-500P so, when P=O; Q=99500 and -20000 + 2000P so, when P=O; and when Q=O; P=200 when Q=O; P=IO In equilibrium, D=S. Solving for P 1 OOOOO-500P = -20000+200P 120000= 700P 171.48 Now, Substituting Price in either demand or supply, we have 100000-500*171.48