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![\left[\begin{array}{ccc}a+b&1-3b\\-1&-6\\\end{array}\right] B= \left[\begin{array}{ccc}2a&b-3\\-1&2\\\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Da%2Bb%261-3b%5C%5C-1%26-6%5C%5C%5Cend%7Barray%7D%5Cright%5D+B%3D+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2a%26b-3%5C%5C-1%262%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}a+b&1-3b\\-1&-6\\\end{array}\right] B= \left[\begin{array}{ccc}2a&b-3\\-1&2\\\end{array}\right]")
C=![\left[\begin{array}{ccc}5&6\\\\-2&-4\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D5%266%5C%5C%5C%5C-2%26-4%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}5&6\\\\-2&-4\end{array}\right]")
jika A+B=C nilai a+b =....
kita ambil kanan atas
1-3b+b-3=6
-2b-2=6
-2b=8
b= -4
kiri atas
a+b+2a=5
3a+(-4)=5
3a=9
a=3
a+b =3+(-4)=-1
nilai a) A+B=C ->a+b+2a=5 -> 3a+(-4)=5 -> 3a=9 -> a=3
jadi nilai a+b=3+(-4)=-1
maaf kalau salah