Question

Solve:
$x-y=5;3x+2y=25$

Answer 1

$x-y=5---\left(1\right)$

$3x+2y=25---\left(2\right)$

$3x-3y=25$

$3x+2y=25$

_______________

$+5y=+10$

$\Rightarrow 5y=10$

$\Rightarrow y=\frac{10}{5}$

$\Rightarrow y=2.$

sub $y=2$ in $\left(1\right)$

$x-y=5$

$\Rightarrow x-2=5$

$\Rightarrow x=5+2$

$\Rightarrow x=7$

$\therefore$ $x=7$ and $y=2$.