19. The slope field for the system y dx 3+ -2x +2 dt C dy =-y dt is shown to the right. (a) Determine the type of the equilibrium point at the origin. D -3 (b) Calculate all straight-line solutions. B (c) Plot the x(1)- and y(t)-graphs, (1 > 0), for the initial conditions A = (1,-2), C = (-2, 2), and D (-2, 0). (2, 1), -3+ !! B = %3D