2x-4y = 11,
4x+4y=1
\right.[/m]
[m]\left\{
2x-4y=11, 6x = 12
\right.
\left\{ 2x-4y = 11, x = 2 \right.
\left\{ -4y = 11 - 4, x = 2 \right.
\left\{ y = -7/4, x = 2 \right.[/m]
Итак, x=2, y = - 7/4 ⇒ [b] (2; - 7/4)[/b].