Question

qual a resposta do sistema {2x-4y=64
{5x+6y=43

pf me ajudem

Answer 1

2x-4y=64x(6) 5x+6y=43x(4)∴ 12x -24y =384 20x+24y= 172∴ 32x =556∴ x=556/32= 139/8∴ 2(139/8)-4y=64∴ 278/8-4y=64∴ 139/4-4y=64∴ 139-16y=256∴ -16y= 256-139∴ -16y=117∴ y=-117/16