Chapter 27, Problem 20P

Use MATLAB to integrate the following pair of ODEs from $t=0\text{ to 100}$:

$\frac{d{y}_1}{dt}=0.35y_1-1.6y_1{y}_2\frac{d{y}_2}{dt}=0.04y_1{y}_2-0.15y_2$

where $y_1=1\text{ and }{y}_2=0.05\text{ at }t=0$. Develop a state-space plot $\left(y_1\text{ versus }{y}_2\right)$ of your results.