1.

The solution of the differential equation `(dy)/(dx)=(a x+g)/(b y+f)`represents a circle when`a=b`b. `a=-b`c. `a=-2b`d. `a=2b`A. a=bB. `a=-b`C. `a=-2b`D. `a=2b`

Answer» Correct Answer - b
We have ,
` (dy)/(dx) = (ax +g)/(by+f)`
` rArr (by + f) dy = (ax + g ) dx`
Onintegrating ,we get
` (by^(2))/2 +fy = (ax^(2))/2 + gx + C`
`rArr ax^(2) - by^(2) + 2gx - 2fy +C = 0`
This represents a circle , if a = -b


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