Answer:
Choice C. -8/ 7
Explanation:
We have to solve the system
[tex]\begin{gathered} -9x+4y=8 \\ -3x-y=4 \end{gathered}[/tex]Multiplying the equation at the bottom by -3 gives
[tex]-9x-3y=12[/tex]Now adding the two equations gives
[tex]undefined[/tex]