Question

Памагите пожалуйсто

Answer 1

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)