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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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