Dear Nhlanhla Muthwam the direction vector of the straight line <-8,2,0>+t<-3,2,-7> is <-3,2,-7>, the straight line is perpendicular to the plane, that is why n=<-3,2,-7>.
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Dear Nhlanhla Muthwam the direction vector of the straight line <-8,2,0>+t<-3,2,-7> is <-3,2,-7>, the straight line is perpendicular to the plane, that is why n=<-3,2,-7>.
How to did you get n=⟨−3,2,−7⟩?