Systems of Differential Equations So far,we have studied the differential equation that in- volves an unknown function and derivatives of this function.In this chapter we shall deal with sets of simultaneous equations that involve several unknown functions and their derivatives. 4日10,1无2000 Linear of Differential EquationsSystems of Differential Equations So far, we have studied the differential equation that in￾volves an unknown function and derivatives of this function. In this chapter we shall deal with sets of simultaneous equations that involve several unknown functions and their derivatives. Example    d 2 x1 dt 2 −2 dx1 dt − dx2 dt = −3e 3t , dx2 dt −6x1 = 0. Linear Systems of Differential Equations