Topic: Using the supply demand model

microeconomics problem

please help me with this question + explanations!

. Suppose we observe that the price and quantity demanded of sandwiches in the Bistro are P = $6r'sandwich and Q = 400 sandwiches per week, respectively. (2 points each) a. If we assume that the demand choke price is P = $12lsandwich and demand is linear, what is an equation for the demand carve for sandwiches? b. If we assume that the maximal market size (the number of sandwiches demanded when P = $0) is Q = 1000 sandwiches per week, what is an equation for the demand curve for sandwiches? c. At what point are these demand curves closest together