\[\boxed{\text{1267.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = kx + b;\]
\[1)\ M(2;1):K( - 3;2):\]
\[2k + b = 1;\ - 3k + b = 2\]
\[\left\{ \begin{matrix} 2k + b = 1\text{\ \ \ \ \ } \\ - 3k + b = 2\ \\ \end{matrix} \right.\ ( - )\]
\[5k = - 1\]
\[k = - 0,2;\ \]
\[b = 1 - 2k = 1 + 0,4 = 1,4.\]
\[Уравнение:\]
\[y = - 0,2x + 1,4.\]
\[2)\ P( - 4;5):Q(4;\ - 3):\]
\[- 4k + b = 5;4k + b = - 3\]
\[\left\{ \begin{matrix} - 4k + b = 5 \\ 4k + b = - 3 \\ \end{matrix} \right.\ ( + )\]
\[2b = 2\]
\[b = 1;\]
\[4k = b - 5 = 1 - 5 = - 4\]
\[k = - 1.\]
\[Уравнение:\]
\[y = - x + 1.\]