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The points P divides the line - segment ...

The points P divides the line - segment joining the points `A(x_(1),y_(1))andB(x_(2),y_(2))` in the ratio m : n . If P lies on the line ax+by +c=0 , prove that,
`(m)/(n)=-(ax_(1)+by_(1)+c)/(ax_(2)+by_(2)+c)`.

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