Odpowiedź:
[tex]1.\\\\\begin{cases}-2x+y=-7\\-3x+4y=-3\end{cases}\\\\\\\begin{cases}y=-7+2x\\-3x+4y=-3\end{cases}\\\\\\-3x+4(-7+2x)=-3\\\\-3x-28+8x=-3\\\\5x=-3+28\\\\5x=25\ \ /:5\\\\x=5\\\\\\y=-7+2*5=-7+10=3\\\\\begin{cases}x=5\\y=3\end{cases}[/tex]
[tex]2.\\\\\begin{cases}2x-y=10\\x-3y=0\ \ /*(-2)\end{cases}\\\\\\+\begin{cases}2x-y=10\\-2x+6y=0\end{cases}\\---------\\5y=10\ \ /:5\\y=2\\\\\\x-3*2=0\\\\x-6=0\\\\x=6\\\\\begin{cases}x=6\\y=2\end{cases}[/tex]
