Consider the differential equations: $$\dot{y} = ty, \qquad \dot{y} = t^{2}y, \qquad \dot{y} = ty^{2}, \qquad \dot{y} = -1, \qquad \dot{y} = t^{2}+y^{2}$$ The above slope field is that for which one of these?
$\dot{y} =$