\[2x + 5y = - 10:\]
\[5y = - 10 - 2x\]
\[\Longrightarrow y = - 2 - \frac{2}{5}x;\]
\[2x = - 10 - 5y\]
\[\Longrightarrow x = - 5 - \frac{5}{2}y.\]