Question

Сисиема.
(x^2+y^2=5
(
(xy=-2

Answer 1

x^2+2xy+y^2=5-4=1
x+y=1                  x+y=-1
xy=-2                    xy=-2
x=2 y=-1            x=-2  y=1
x=-1 y=2            x=1 y=-2