Odpowiedź:
[tex]\begin{cases}2y-5x=6\\-x=-y+6\ \ /*(-1)\end{cases}\\\\\\\begin{cases}-5x+2y=6\\x=y-6\end{cases}\\\\\\-5(y-6)+2y=6\\\\-5y+30+2y=6\\\\-3y=6-30\\\\-3y=-24\ \ /:(-3)\\\\y=8\\\\\\x=8-6=2\\\\\\\begin{cases}x=2\\y=8\end{cases}[/tex]
