Prove that:
$3 x - 5 y = 16; x - 3 y = 8$

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Solution

$(x - 3 y = 8) \times 3$
$\Rightarrow 3 x - 9 y = 24$
(-)3x-5y=16
________
-4y=8 $\Rightarrow y = - 2$
$x - 3 y = 8 \Rightarrow x = 3 y + 8 = - 6 + 8 = 2 \Rightarrow x = 2$

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