Donnez les équations explicites des droites:

1. $(d_1)\hspace{5mm} 4x=2y \hspace{3mm}\hspace{5mm}$
2. $(d_2)\hspace{5mm} x=\frac{2}{3}y \hspace{3mm}\hspace{5mm}$
3. $(d_3)\hspace{5mm} \frac{2}{3}x-\frac{y}{3}=\frac{2}{5}\hspace{3mm}\hspace{5mm}$
4. $(d_4)\hspace{5mm} \frac{2}{3}x=\frac{2}{5}\hspace{3mm}\hspace{5mm}$