Question

Помогите решить систему уравнения
{X^2+y^2=5
{X+y=1

Answer 1

x=1-y
$(1-y)^{2}+y^{2}=5$
$1-2y+y^{2}+y^{2}-5=0$
$2y^{2}-2y-4=0$
$y^{2}-y-2=0$
y1=-1
y2=2
x1=1-(-1)=2
x2=1-2=-1