September 2018 1 121 Report
Diketahui Persamaan Matriks  \left(\begin{array}{ccc}1&1\\a&2\end{array}\right) \left(\begin{array}{ccc}x\\y\end{array}\right) = \left(\begin{array}{ccc}8\\4\end{array}\right) .
Jika determinan dari  \left(\begin{array}{ccc}1&1\\a&2\end{array}\right) = 1 , nilai x + y adalah...

a.16
b.12
c.8
d.4
e.0

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