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```        The curve satisfying the eqn
dy / dx = (y2 - 2xy - x2) / (y2 + 2xy - x2)    passes through (-1, 1) is a
(a) staight line      (b) circle    (c) ellipse     (d) none of these```
8 years ago

147 Points
```										Dear Sanchit Gupta
dy / dx = (y2 - 2xy - x2) / (y2 + 2xy - x2)
Let y=vx
dy/dx =v+xdv/dx

so v+x dy/dx =(v2 - 2v -1) / (v2 + 2v - 1)
x dv/dx =(v2 - 2v -1) / (v2 + 2v - 1)     -v
x dv/dx = -(v3 +v2 +v +1)/(v2 + 2v - 1)
(v2 + 2v - 1)/(v3 +v2 +v +1)  dv =-dx/x

Now variable are seperated you can solve the differential equation

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```
8 years ago
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