If [ array ll 1 & 2 2 & 1 array ] [ array l x y array ]= [ array l 5 4 array ] then
Mathematics · JEE Main · NTA Exams — Matrices and Determinants
\(\text { If }\left[\begin{array}{ll}
1 & 2 \\
2 & 1
\end{array}\right]\left[\begin{array}{l}
x \\
y
\end{array}\right]=\left[\begin{array}{l}
5 \\
4
\end{array}\right] \text { then }\)
- x = 2, y = 1
- x = 1, y = 2
- x = 3, y = 2
- x = 2, y = 3
Answer
(B) x = 1, y = 2
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