Berarti :
2x(3) +4.y = 0 --> 6x +4y = 0
2y -3x = -12--> -6x+4y = -24
---------------------------------------- -
12x = 24
x = 2
6x +4y = 0
6(2) +4y = 0
12+4y = 0
4y = -12
y = -12/4
y = -3
x+y = 2+(-3) = -1
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![\left[\begin{array}{ccc}3&y\\y&-3\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26y%5C%5Cy%26-3%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}3&y\\y&-3\end{array}\right]")
= ![\left[\begin{array}{ccc}0&-24\\0&-12\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D0%26-24%5C%5C0%26-12%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}0&-24\\0&-12\end{array}\right]")
adalah .... 
Berarti :
2x(3) +4.y = 0 --> 6x +4y = 0
2y -3x = -12--> -6x+4y = -24
---------------------------------------- -
12x = 24
x = 2
6x +4y = 0
6(2) +4y = 0
12+4y = 0
4y = -12
y = -12/4
y = -3
x+y = 2+(-3) = -1