15. Consider the following linear supply/demand model of price and quantity in a competitive market. Note that lo (buyers' income) and Wo (wage rates) are exogenously given and strictly positive. Qd = 100 - 200P + 210; 10 > 0 Qs = -300+800P - 40Wo; W. > 0 Qs = Qd a. Write down the matrix equation (Ax = b) whose solution vector (x) is the model's equilibrium. In particular, let x = b. Use Cramer's rule to solve the model for the function that relates the equilibrium price (P*) to buyers' income (lo) and wage rates (Wo) C. Based on your answer to (b), will price (P*) rise or fall when lo increases, all else equal? What about when Wo increase, all else equal? Explain