Find the direction cosines of the two lines which are connected by th relations. `l-5m+3n=0` and `7l^2+5m^2-3n^2=0`

Explanation

Consider the given equation, `l−5m+3n=0`

`l=5m−3n --------(1)`


Substitute the l in `7l^2+5m^2−3n^2=0`

we get `2m-n=0` and `3m−2n=0 `

case (1) : `3m−2n=0 =>m=(2n)/3​`

Substitute for m in (1)

`l=n/3`

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