Х^2 + y^2 = 10
X - y = - 2
••••••••••
X = y - 2
( y - 2 )^2 + y^2 = 10
y^2 - 4y + 4 + y^2 - 10 = 0
2y^2 - 4y - 6 = 0
2( y^2 - 2y - 3 ) = 0
D = 4 + 12 = 16 = 4^2
y1 = ( 2 + 4 ) : 2 = 3
y2 = ( 2 - 4 ) : 2 = - 1
X = y - 2
X1 = 3 - 2 = 1
X2 = - 1 - 2 = - 3
Ответ ( 1 ; 3 ) ; ( - 3 ; - 1 )