Х=у+1
Х^2+у^2+2ху=9
(У+1)^2+у^2+2(у+1)у=9
У^2+2у+1+у^2+2у^2+2у=9
4у^2+4у=8
4у(у+1)=8
4у=8 у=2
У+1=8 у=7
Х=2+1=3
Х=7+1=8
2n(x-y)+(x-y)=(x-y)(2n+1)
Y=K/x
K = xy
C (8; -3)
x=8
y=-3
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K = -3*8 = -24
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y = -24/x
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D = (-√6; 4√6)
x=-√6
y=4√6
4√6 = -24/√6
Точка D не принадлежит графику функции.