First Order Differential Equations I am having trouble isolating the $x$ and $y$ to separate side in the differential equations below.  Could someone give me a hint as to how to to this.
Equation 1:  $$\frac{dy}{dx} - \frac{x}{y}  = \frac{1}{x}$$ 
Equation 2:  $$xy\frac{dy}{dx} = y^2$$

The second one is $\dot y = \frac{y}{x}$, and then you should try to put $y=xz$ and solve for $z$.
