Question

Resolva o Sistema:
2x-4y=6
x-2y=3

Answer 1

2x-4y=6
x-2y=3   --- x= 3+2y     ---- x=3

substituindo II em I
2(3+2y)-4y=6
6+4y-4y=6
4y-4y=6-6
y = 0

Answer 2

$2x-4y=6 \\ x-2y=3$
substituímos fica assim:  $x=3+2y$
$2x-4y=6 \\ 2(3+2y)-4y=6 \\ 6+4y-4y=6 \\ 4y-4y=6-6 \\ y=0$

$x-2y=3 \\ x -2.0=3 \\ X=3$

PROVA
$2*3-4*0=6 \\ 6=6 \\ 3-2*0=3 \\ 3=3$