$$\left. \begin{array} { l } { 2 x ^ { 2 } + x - 1 = 0 } \\ { x ^ { 2 } - x \right.$$
$x=\frac{1}{2}=0.5\text{, }y=-\frac{1}{4}=-0.25$
$x=-1\text{, }y=2$
