Question

{X+Y=12
{3x+y=20
{Y+2x=20
{3y+4x=20

Answer 1

Resposta:

Y=8 e X=4

Explicação passo a passo:

x=12-y ***3(12-y)+y=20 ***36-3y+y=20 ***36-2y=20 ***-2y=20-36 ***-2y=-16

***2y=16 ***y=16/2 ***y=8 ***x=12-y ***x=12-8 ***x=4