The Critical Points of the System $\frac { d x } { d t } = 2 x + y ^ { 2 } , \frac { d y } { d t } = 2 x - 3 y$

Multiple Choice

The critical points of the system $\frac { d x } { d t } = 2 x + y ^ { 2 } , \frac { d y } { d t } = 2 x - 3 y$ are

A) $y = 0 , y = - 3$
B) $x = 0 , x = - 9 / 2$
C) $$( 0,0 )$$
D) $( 0,0 ) , ( - 9 / 2 , - 3 )$
E) $( - 9 / 2 , - 3 )$