PS 9 1. The following system is similar, but not identical to both the goods market from the IS-LM model in Chiang (p 109) and the problem from your midterm. Treat Y, C and I as endogenous variables. Y -C+1+Go (1) C =a+6(1 -t) Y (2) I - d - ei + fy (3) (a) Solve for equilibrium Y using any method you like. (b) Find the partial derivative of equilibrium Y with respect to t. (c) Verify your previous answer using the implicit function theorem. (d) Use the implicit function theorem to find the partial derivative of equilibrium I with respect to t. 2. Answer question 1 from Exercise 9.2. 3. Answer question 3 from Exercise 9.2. 4. Answer question 1 from Exercise 9.3/