1.

The differental equation `y(dy)/(dx)+x=C` representsA. a family of hyperbolaB. a family of circles whose centres are on y-axisC. a family of circle of parabolasD. a family of circles whose centres are on x-axis.

Answer» Correct Answer - D
We have,
`y(dy)/(dx)+x=C`
`rArr" "ydy+(x-C)dx=0`
`rArr" "(y^(2))/(2)+((x-C)^(2))/(2)=C_(1) rArr (x-C)^(2)+y^(2)=2C_(1)`
Clearly, it represents a family of circles having their centres on x-axis.


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