\[\boxed{\text{974\ (974).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[(0;0):\]
\[11x - 13y = a + 4\]
\[0 - 0 = a + 4\]
\[a = - 4\]
\[Ответ:\ при\ a = - 4.\]
\[\boxed{\text{974.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ x = - 1 \Longrightarrow \text{\ \ }y = - 10 + 1 =\]
\[= - 9\]
\[2)\ x = 3 \Longrightarrow \ y = 10 \cdot 3 + 1 = 31\]
\[3)\ x = - \frac{1}{5} \Longrightarrow \text{\ \ }y = \frac{10}{- 5} + 1 =\]
\[= - 1\]
\[4)\ x = 7 \Longrightarrow \text{\ \ }y = 10 \cdot 7 + 1 =\]
\[= 71\]