$$\frac {dy_1}{dt}=-ry_{1}\ln\left(\dfrac{y_1}{a+by_{2}}\right)$$
$$\frac{dy_2}{dt}=-ry_{2}\ln\left(\dfrac{y_2}{c+dy_{1}}\right)$$
I've been trying since forever. I see the trivial solution but how do I find my logarithmic zeroes and represent it in terms of (y1*,y2*)?