Question

evaluate:
$3x-5y=16;x-3y=8$

Answer 1

$3x-5y=16⟶\left(1\right)$

$x-3y=8⟶\left(2\right)$

From eqn $\left(2\right)$, $x=8+3y$

In eqn $\left(1\right)$

$3(8+3y)-5y=16$

$\Rightarrow 24+9y-5y=16$

$4y=-8$

$y=-2$

So,

$x=8+3(-2)$

$=8-6=2$

Hence, this is the answer.