$$\left. \begin{array} { l } { x y = \frac { 4 x } { 5 } } \\ { 2 x + 3 y = 9 } \end{array} \right.$$
$x=0\text{, }y=3$
$x=\frac{33}{10}=3.3\text{, }y=\frac{4}{5}=0.8$
