Bonsoir ;
1)
[tex]\left \{\begin {matrix} x = 3t-1 \\ y=4t+2\\ t\in \mathsbb R\end{umatrix}[/tex]
2)
[tex]\left \{\begin {matrix} x = t+2 \\ y=-2t-3\\ t\in \mathsbb R\end{umatrix}[/tex]
3)
[tex]\left \{\begin {matrix} x = 5t+1 \\ y=-7t\\ t\in \mathsbb R\end{umatrix}[/tex]
4)
[tex]\left \{\begin {matrix} x = t \\ y=-3\\ t\in \mathsbb R\end{umatrix}[/tex]