4 From the two equations in Question 1, write the corresponding matrix equation Ay = b, where A is a 2x2 matrix, by completing the missing elements. 9 marks Find the determinant and the adjoint of A. adj (A) = A = 4 marks 4 marks Substituting b for the first column of A produces a new matrix Ay. Complete the following equation: IAlHere is a two-equation macroeconomic model, where Y and Ct are output and consumption at time t, and X is investment, assumed constant. Assume that 0