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If the d.c's (l,m,n) of two lines are c...

If the d.c's (l,m,n) of two lines are connected by the relations `7l^(2) + 5m^(2) - 3n^(2) = 0`, l - 5m + 3n = 0 then the d.c's of the two lines are

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The correct Answer is:
`((-1)/(sqrt(6)),(1)/(sqrt(6)),(2)/(sqrt(6)))((1)/(sqrt(14)),(2)/(sqrt(14)),(3)/(sqrt(14)))`
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