Question

{x^2+y^2=10, x+y=-4:

Answer 1

x=-4-y
(-4-y)^2 +y^2=10
16+8y+y^2+y^2=10
2y^2+8y+6=0
y^2+4y+3=0
y1=-3
y2=-1
x1=-1
x2=-3