Odpowiedź:
[tex]\begin{cases}4x-2y=5\\y-4x=-4,5\end{cases}\\\\\\\begin{cases}4x-2y=5\\-4x+y=-4,5\ \ /\cdot2\end{cases}\\\\\\+\begin{cases}4x-2y=5\\-8x+2y=-9\end{cases}\\----------\\-4x=-4\ \ /:(-4)\\x=1\\\\\\4\cdot1-2y=5\\\\4-2y=5\\\\-2y=5-4\\\\-2y=1\ \ /:(-2)\\\\y=-\frac{1}{2}\\\\\begin{cases}x=1\\y=-\frac{1}{2}\end{cases}\\\\\\Uklad\ \ r\'owna\'n\ \ oznaczony[/tex]
