Question:
If $\left(\begin{array}{cc}x & y \\ 3 y & x\end{array}\right)\left(\begin{array}{l}1 \\ 2\end{array}\right)=\left(\begin{array}{l}3 \\ 5\end{array}\right)$ then
A. $x=1, y=2$
B. $x=2, y=1$
C. $x=1, y=1$
D. none of these
Solution:
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