\[\boxed{\text{991\ (991).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ 0x + y = - 3\]
\[y = - 3 \Longrightarrow график\ d.\]
\[2)\ 2x - y = 1\ \]
\[y = 2x - 1\ \]
\[при\ x = 1 \Longrightarrow \ \ y = 2 - 1 = 1 \Longrightarrow \ \]
\[\Longrightarrow \ прямая\ c.\]
\[3)\ 3x + 0y = 6\ \ \]
\[3x = 6\ \]
\[x = 2 \Longrightarrow прямая\ b.\]
\[4)\ x + 2y = 0\]
\[2y = - x\ \ \]
\[при\ y = - 1 \Longrightarrow \ x = 2 \Longrightarrow \text{\ \ }\]
\[\Longrightarrow прямая\ a.\]