Matematika

Pertanyaan

Diket :
3[tex] \left[\begin{array}{ccc}x\\y\\\end{array}\right] [/tex] + 4[tex] \left[\begin{array}{ccc}y\\x\end{array}\right] [/tex] = [tex] \left[\begin{array}{ccc}1\\-1\end{array}\right] [/tex]

maka nilai x + y = ?

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