x-y=6 x2+y2=20
x=6+y
(6+y)2+y2=20
36+12y+ y2+ y2=20
2 y2+12y+16=0
D=b2-4ac=144-128=16
y1=-2
y2=-4
x1=4
x2=2
x-y=6 x2+y2=20
x=6+y
(6+y)2+y2=20
36+12y+ y2+ y2=20
2 y2+12y+16=0
D=b2-4ac=144-128=16
y1=-2
y2=-4
x1=4
x2=2