Modeling Lotka-Volterra equation

Question

Consider the case $a < b c$ in the Lotka-Volterra equations for the rabbits and foxes $\newcommand{\dd}{\mathrm{d}}$ \begin{align} \frac{\dd R}{\dd t} &= (a − b R − F )R, \\ \frac{\dd F}{\dd t} &= ( –c + R)F. \end{align} Sketch the phase plane and use it to determine the populations as $t → ∞$.