Fi­nd the critical points and phase portrait of the given autonomous fi­rst-order differential equation. Classify each critical point as asymptotically stable, unstable, or semi-stable. By hand, sketch typical solution curves in the regions in the xy-plane determined by the graphs of the equilibrium solutions.

1. dy/dx = y² – 3y

2. dy/dx = y² – y³

3. dy/dx = (y - 2)⁴

4. dy/dx = 10 + 3y – y²

5. dy/dx = y²(4 – y²)

6. dy/dx = y(2 - y)(4 – y)

7. dy/dx = y ln(y + 2)

8. dy/dx = (ye^y – 9y) / e^y