Let us consider a system of n linear first order differential equations as y = Ay + u (2) where the matrix of coefficients, A, is called the coefficient matrix of the system. a) If A is constant and u = 0, explain what type of equation the above equation is (lin- ear/nonlinear homogeneous/nonhomgeneous, etc.) and how to solve it. b) If A is constant and u 0, explain what type of equation the above equation is and how to solve it.