Question

resposta da conta {3x-2y=8 2x+5y=12

Answer 1

{3x-2y=8. (-2)
{2x+5y=12

{-6x+4y=16
{2x+4y=12 . (-1)

{ -6x+4y=16
{-2x-4y= -12

cortandoo os 4y

-4x=4
X=4/-4
x= -2