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Hey guys, I'm studying for the May 2019 IB exams and I'm currently stuck on vectors. I was wondering how you find a perpendicular and/or parallel vector to a 3D vector? For example. "Find an equation of the line perpendicular to vector (3, 0, -1) and passing through point (4, 2, 1)." or, "Find the equation of the line parallel to vector (3, -2, 8), and passing through (3, 1, -2)" Thanks in advance