Question 822605
They are not linear.
They are two circles.
x^2+y^2-2x+2y-3=0 
(x-1)^2+(y+1)^2=5 
x^2+y^2-x+y-4=0
(x-1/2)^2+(y+1/2)^2=9/2 
y=x-1
x = -1,   y = -2
x = 2,   y = 1