X+y=-2 x2+y2=100

Question

X+y=-2 x2+y2=100

Answer 1

х=-2-у

(2+у)²+у²=100

4+4у+2у²-100=0

у²+2у-48=0

Д=4+4*48=(2*7)²

у1=(-2+14)/2=6

у2=(-2-14)/2=-8

х1=-8

х2=6

Ответ:(6;-8);(-8;6)