\[5x - 4y = 40;\ \ \ (8;0) -\]
\[частное\ решение.\]
\[x = x_{0} + bn;\ \ y = y_{0} - an\]
\[x = 8 - 2n;\]
\[y = 0 - 5n = - 5n;\ \ n \in Z.\]
\[Ответ:x = 8 - 2n;\ \ y = - 5n;\ \ \]
\[n \in Z.\]