Памагите пожалуйсто
1/2x+y=t
1/2x-y=u
3t+u=2/5 7t+2u=3/5
-6t-2u=-4/5
t=(-6t-2u)+(7t=2u)=-1/5
3(-1/5)=u=2/5
u=1
(t, u) = (-1/5, 1)
1/2x+y=-1/5 1/2x-y =1
2x+y=-5 2х-y=1
4x=-5+1=-4
x=-1
2(-1)-y=1
y=-3
(x, y) = (-1, -3)