tolong bantuin no 71

anggap matriks A adalah[tex] \left[\begin{array}{cc}a&b\\c&d\end{array}\right] [/tex]


5a + 0b = -10            a = -2
-3a + 6b = 30
5c + 0d = 35            c = 7
-3c + 6d = -27

-3a + 6b = 30
-3(-2) + 6b = 30
6 + 6b = 30
6b = 24
b = 4

-3c + 6d = -27
-3(7) + 6d = -27
-21 + 6d = -27
6d = -6
d = -1

jadi matriks A nya adalah
[tex] \left[\begin{array}{ccc}-2&4\\7&-1\end{array}\right] [/tex]