y' = -ky y' = -ky ------- k=0.1, 0.2, 0.3 5dy/dt = -y(t) + u(t) -- Unit Step dx/dt = 3e-t ---- dy/dt = 3 - y(t) 2x'=-x+u ------- 5y'=-y+x y'' + 5y' + 6y = 0 y'' + 2y' + 2y = cos(2x) y'' + 8y' + 17y = 3e-4t + 2cos(t)