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You need to check if the lines are parallel, hence, you need to test if the direction vectors of the lines are scalar multiples of each other.

`<2,-8,-6> = k*<-3,12,9> => {(2 = -3k),(-8 = 12k),(-6 = 9k):}`

`{(k = -2/3),(k = -8/12),(k = -6/9):}`

Reducing duplicate factors yields:

`{(k = -2/3),(k = -2/3),(k = -2/3):}`

** You may notice that `<2,-8,-6>` and `<-3,12,9>` are scalar multiples of each other, hence, the lines are parallel.**

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