Question

Solve:

1. 2 y - x = 0.

2. 10 x +15 y = 105.

Answer 1

$2y-x=0$ & $10x+15y=105$

$\Rightarrow x=2y$ & $2x+3y=21$

$2\left(zy\right)+3y=21$

$\Rightarrow 7y=21$

$\Rightarrow y=3$

$x=2y=2\left(3\right)=6$

$\therefore x=6$

$y=3$.