\[\boxed{\text{273\ (273).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = - 5x + 6\ \ \]
\[Выразим\ x\ через\ y:\]
\[y - 6 = - 5x\]
\[x = \frac{6 - y}{5}.\]
\[если\ \ y = 6:\]
\[\ x = \frac{6 - 6}{5} = 0.\]
\[если\ \ y = 8:\ \ \]
\[x = \frac{6 - 8}{5} = - \frac{2}{5} = - 0,4.\]
\[если\ \ y = 100:\]
\[x = \frac{6 - 100}{5} = - \frac{94}{5} = - 18,8.\]