Question

Solve $2y-x=0;10x+15y=105$

Answer 1

$2y-x=0$ __(1) , $10x+15y=105$ __(2)

Multiplying equation (1) by 10 and adding equation (2)

$-10x+20y=0$

$10x+15y=105$

________________

$35y=105$

$y=3$

$2y-x=0$
$2\alpha 3-x=0$

$\therefore x=6$