\( \begin{pmatrix} x & y \\ 3y & x \\ \end{pmatrix} \)\( \begin{pmatrix} 1 \\ 2 \\ \end{pmatrix} \)
Comparing with R.H.S
x + 2y = 3 ------- (i)
2x + 3y = 5 -------- (ii)
(i) x 2 – (ii)
2x + 4y – 2x + 3y = 6 - 5
y = 1
Putting y in (i)
x + 2(1) = 3
x = 1