Решите систему уравнений x2+y^2=5 x-y=1

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

x = y + 1

(y + 1)^2 + y^2 = 5

2y^2 + 2y - 4 = 0

y^2 + y - 2 = 0;

D = 1 + 8 = 9

y1 = (-1 + 3) / 2 = 1 => x1 = 2

y2 = (-1 - 3) / 2 = -2 => x2 = -1

Ответ: (2, 1) и (-1, -2)