explain everything please, i want to understand. if the equilibriumis at 0, what does it tell? does tht mean that it is neitherpositive or negative so not a saddle but also not unstable orstable?? For each of the following linear systems \( d \vec{x} / d t=A x \), characterize the equilibrium at \( \vec{x}=0 \). Draw a sketch of the solutions in the \( (x, y) \) plane. 1a. \( A=\left[\begin{arr 2 answers