Question

Solve for $x,y$

$4x-y=4;x-4y=16$

Answer 1

$4x-y=4,....\left(1\right)x-4y=16...\left(2\right)$

$\left(1\right)-4\left(2\right)$

$\Rightarrow 4x-y=4$

$4x-16y=64$

$-$

________________

$15y=-60$

$y=-4$

$x=0$