$$\frac{dy}{dx}=y^2-9$$

$$\frac{dy}{dx}=y^2-4$$

$$\frac{dy}{dx}=y-y^2$$

$$\frac{dy}{dx}=y\left(y+2\right)$$

$$\frac{dy}{dx}=\left(1+e^{-x}\right)\left(y^2-1\right)$$

$$\frac{dy}{dx}=\frac{x}{2x-y}$$

$$\frac{dy}{dx}=\frac{x+3y}{x-y}$$