Question

Solve:
$3x-y=0$ and $2x+y=5$

Answer 1

$3x-y=0$

$\Rightarrow y=3x$

Substitute $y=3x$ in $2x+y=5$

$\Rightarrow 2x+3x=5$

$\Rightarrow 5x=5$

$\therefore x=\frac{5}{5}=1$

Put $x=1$ in $y=3x=3\times 1=3$

$\therefore x=1,y=3$