Solve the differential equation $\frac{dy}{dx}=\frac{x}{9y}.$

Find an implicit solution and put your answer in the following form $($it should start with $y^2)$:

$=$ constant. help $($formulas$)$

Find the equation of the solution through the point $(x,y)=(3,1).$

$$ help $($equations$)$

Find the equation of the solution through the point $(x,y)=(0,-7).$ Your answer should be of the form $y=f(x).$

$$ help $($equations$)$