\[\boxed{\text{882\ (882).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = kx + b;\ \ \ M\ (3;0);\ \]
\[\ K\ (0; - 1)\]
\[3k + b = 0\]
\[0 \cdot k + b = - 1\ \ \]
\[b = - 1.\]
\[3k - 1 = 0\ \]
\[3k = 1\ \]
\[k = \frac{1}{3}\]
\[Ответ:b = - 1;\ \ \ k = \frac{1}{3}.\]