\[\boxed{\text{328\ (328).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ A\ ( - 5;4):\ \]
\[4 = \frac{k}{- 5}\ \]
\[k = - 5 \cdot 4 = - 20.\ \]
\[2)\ B\ \left( \frac{1}{6};\ - 2 \right):\ \ \]
\[- 2 = \frac{k}{\frac{1}{6}}\]
\[k = - 2 \cdot \frac{1}{6} = - \frac{1}{3}.\]
\[3)\ \text{C\ }(1,5;\ - 8):\ \ \]
\[- 8 = \frac{k}{1,5}\text{\ \ }\]
\[k = - 8 \cdot 1,5 = - 12.\]