Question

Решите систему уравнений

Answer 1

$left { {{2x+y=1} atop {5x+2y=0}} right. left { {{y=1-2x} atop {5x+2y=0 }} right. left { {{y=1-2x} atop {5x+2(1-2x)}} right. left { {{y=1-2x} atop {5x+2-4x}} right. left { {{y=1-2x} atop {x=-2}} right. left { {{y=5} atop {x=-2}} right.$