$x=2$  $8-y=7$ 
Which of the following is a solution of $$\begin{cases}2x-4=0 \textbackslash\textbackslash{} 4x-y=7 \end{cases}$$? 
[A] ($x$,$y$)=($2$,$-1$) 
[B] ($x$,$y$)=($2$,$1$) 
[C] ($x$,$y$)=($-2$,$1$) 
[D] ($x$,$y$)=($-2$,$-1$) 