x-y=2
x²+y²=20
x=2+y
(2+y)²+y²=20
4+4y+y²+y²-20=0
2y²+4y-16=0 |:2
y²+2y-8=0
y1=-4;y2=2
x1=2-4=-2;x2=2+2=4
y1=-4; y2=2
x1=-2; x2=4
(-2;-4);(4;2)
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Answers & Comments
x-y=2
x²+y²=20
x=2+y
x²+y²=20
x=2+y
(2+y)²+y²=20
x=2+y
4+4y+y²+y²-20=0
x=2+y
2y²+4y-16=0 |:2
x=2+y
y²+2y-8=0
x=2+y
y1=-4;y2=2
x1=2-4=-2;x2=2+2=4
y1=-4; y2=2
x1=-2; x2=4
y1=-4;y2=2
(-2;-4);(4;2)