The equation x^(2)+(lambda+mu)xy+lambda ...

The equation `x^(2)+(lambda+mu)xy+lambda mu y^(2)+x+mu y=0` represents two parallel lines if

`lambda+mu=0`

`lambda=4 mu`

`lambda=mu`

`lambda=3mu`

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AAKASH SERIES-PAIR OF STRAIGHT LINES-EXERCISE -I

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