Need help with question. Can you please explain where everything come from and how to solve because I have answers but don't understand the concept?

24. Equilibrium prices and quantities are determined by demand D1 = 200 - 2p, and supply S1 = 2p1 - 40 in the market for Good 1 and by D2 = 240- 2p2 and supply S2 = 2p2 - p1 - 20 in the market for Good 2. a. Provide a diagram showing the equilibrium price and quantity in the market for Good 1 and a second diagram showing the equilibrium price and quantity in the market for Good 2. b. Next month the government will introduce a t = 40 per unit tax in the market for Good 1 (not Good 2). Update your diagrams to show and quantify how prices and quantities will be affected in both markets. c. Illustrate (do not calculate) how the price of Good 2 would be affected if the demand curve in Market 1 was less elastic