Question

Solve for $x$ and $y$ : $\frac{x}{2}+\frac{y}{4}=3,2x-y=4$.

Answer 1

$\frac{x}{2}+\frac{y}{4}=3)\times 4\Rightarrow 2x+y=12$

$2x-y=4$

_______________

$4x=16\Rightarrow x=4$

$y=2x-4=8-4$

$\Rightarrow y=4$.