$x=2$  $8-y=7$ 
Which of the following pairs is a solution of $$\begin{cases}2x-4=0 \textbackslash\textbackslash{} 4x-y=7 \end{cases}$$? 
Options:
1: ($x$,$y$)=($2$,$-1$) 
2: ($x$,$y$)=($2$,$1$) 
3: ($x$,$y$)=($-2$,$1$) 
4: ($x$,$y$)=($-2$,$-1$) 