Question

Решите систему уравнения:
y-2x=2
2x-4y=8

Answer 1

$left { {{y-2x=2} atop {2x-4y=8}} right.$
$left { {{y=2+2x} atop {2x-4(2+2x)=8}} right.$
$left { {{y=2+2x} atop {2x-8-8x=8}} right.$
$left { {{y=2+2x} atop {2x-8x=8+8}} right.$
$left { {{y=2+2x} atop {-6x=18}} right.$
$left { {{y=2+2x} atop {x=-3}} right.$
$left { {{y=2+2*(-3)} atop {x=-3}} right.$
$left { {{y=2+(-6)} atop {x=-3}} right.$
$left { {{y=2-6} atop {x=-3}} right.$
$left { {{y=-4} atop {x=-3}} right.$
Ответ: y=-4; x=-3.