The lines joining the origin to the poin...

The lines joining the origin to the points of intersection of the curves :
`ax^(2)+2hxy+by^(2)+2gx=0 and a'x^(2)+2h'xy+b'y^(2)+2g'x=0` are ate right angles if :

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The correct Answer is:

`therefore (a+b)g'=(a'+b')g`.

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