nomor 11 dan 12 tolong dijawab 11: maka x+y memenuhi persamaan ab-3b=c 12: maka p+q+r+s=....

no. 11
[tex] \left[\begin{array}{ccc}x&2\\5&y\end{array}\right] \left[\begin{array}{ccc}1&1\\2&0\end{array}\right] - 3\left[\begin{array}{ccc}1&1\\2&0\end{array}\right] = \left[\begin{array}{ccc}4&0\\-3&5\end{array}\right] [/tex]

[tex] \left[\begin{array}{ccc}x + 4&x\\5 + 2y&5\end{array}\right] - \left[\begin{array}{ccc}3&3\\6&0\end{array}\right] = \left[\begin{array}{ccc}4&0\\-3&5\end{array}\right] [/tex]

x - 3 = 0
x = 3

5 + 2y - 6 = -3
2y - 1 = -3
2y = -3 + 1
2Y = -2
Y = -1

X + Y = 3 - 1 = 2