a. Find the most general real-valued solution to the linear system of differential -3 -167 equations a' = x. 1 -3 x₁(t) -4e^(-3t)sin4t = C1 + c₂ x₂(t) e^(-3t)cos4t b. In the phase plane, this system is best described as a O source / unstable node O sink/stable node saddle O center point / ellipses O spiral source O spiral sink O none of these 4e^(-3t)cos4t e^(-3t)sin4t