\(a,\Leftrightarrow\left\{{}\begin{matrix}a=-2\\-a+b=2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=-2\\b=0\end{matrix}\right.\Leftrightarrow y=-2x\\ b,\Leftrightarrow\left\{{}\begin{matrix}-a+b=0\\b=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=3\\b=3\end{matrix}\right.\Leftrightarrow y=3x+3\\ c,\Leftrightarrow\left\{{}\begin{matrix}a+b=2\\3a+b=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=2\\b=0\end{matrix}\right.\)
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