persamaan matriks pake caranya

maaf jika salah jawabannya

Ans:
Mencari nilai x:
[tex] \left[\begin{array}{ccc}2x&4\\7&y\end{array}\right]= \left[\begin{array}{ccc}3&2\\3&4\end{array}\right]- \left[\begin{array}{ccc}5&-2\\-1&10\end{array}\right] \\ \\ \begin{array}{rcl}2x&=&3-2\\2x&=&-2\\x&=&\frac{-2}{2}\\x&=&-1\end{array}\right] [/tex]

Mencari nilai y:
[tex]\left[\begin{array}{ccc}2x&4\\7&y\end{array}\right]= \left[\begin{array}{ccc}3&2\\3&4\end{array}\right]- \left[\begin{array}{ccc}5&-2\\-1&10\end{array}\right] \\ \\ \begin{array}{rcl}y&=&4-10\\y&=&-6\end{array}\right][/tex]

Maka nilai dari [tex]2x+y=2\cdot(-1)+(-6)=-2-6=\textbf{c.\;-8}[/tex].