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The differential equation `y(dy)/(dx)+x=C` representsA. family of hyperbolasB. family of parabolasC. family of ellipsesD. family of circles

Answer» Given, that `y(dy)/(dx)+x=C`
`Rightarrow y(dy)/(dx)=C-x`
`Rightarrow ud y=(C-x)dx`
On integrating both sides, we get
`(y^(2))/(2)=Cx-(x^(2))/(2)+K`
`Rightarrow (x^(2))/(2)+(y^(2))/(2)=Cx+K`
`Rightarrow (x^(2))/(2)+(y^(2))/(2)=Cx+K`
`Rightarrow (x^(2))/(2)+(y^(2))/(2)=Cx=K`
Which represent family of circles.


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