\[2x + y = 3\]
\[y = 3 - 2x\]
\[x = 0 \rightarrow y = 3;\]
\[x = 1 \rightarrow y = 1;\]
\[x = 2 \rightarrow y = - 1.\]
\[Ответ:(0;3);(1;1);(2; - 1).\]