mohon bantuannya dong.. klok boleh tulis tangan ya.. biar lebih jelas.. hehe

[tex]\displaystyle A+B=C\\\left[\begin{array}{ccc}4&4\\1&4y\end{array}\right]+\left[\begin{array}{ccc}2x&-9\\2&5\end{array}\right]=\left[\begin{array}{ccc}2&-5\\3&-11\end{array}\right]\\\left[\begin{array}{ccc}4+2x&4-9\\1+2&4y+5\end{array}\right]=\left[\begin{array}{ccc}2&-5\\3&-11\end{array}\right]\\\\\therefore\\4+2x=2\\2x=-2\\\\4y+5=-11\\4y=-16\\y=-4\\\\2x+y=-2-4\\\boxed{\boxed{2x+y=-6}}[/tex]