2x - y = 7, 5х=-2, x=-2/5, x=-2/5, x=-2/5, x=-2/5
3x +y=-9 2х-y=7 2*(-2/5)-y=7 -4/5-y=7 -y=7+4/5 y=-7 4/5
ответ: х=-2/5, y=-7 4/5
2x - y = 7, 5х=-2, x=-2/5, x=-2/5, x=-2/5, x=-2/5
3x +y=-9 2х-y=7 2*(-2/5)-y=7 -4/5-y=7 -y=7+4/5 y=-7 4/5
ответ: х=-2/5, y=-7 4/5