\[y = \frac{k}{x - x_{0}} + y_{0};\ \ \ \ x_{0} = 4;\ \ \]
\[y_{0} = - 2\]
\[y = \frac{k}{x - 4} - 2;\ \ \ \ (1; - 1):\]
\[- 1 = \frac{k}{1 - 4} - 2\]
\[\frac{k}{- 3} = 1\]
\[k = - 3.\]
\[Ответ:x_{0} = 4;\ \ y_{0} = - 2;\ \]
\[\ k = - 3.\]