Find a vector parametrization and parametric equations for the line with the given description. 1. Passes through P = (4, 0, 8), direction vector v = 7i + 4k. 2. Passes through (1, 1, 1) and (3, -5, 2). 3. Perpendicular to the xy plane, passes through the origin. 4. Parallel to the line through (1, 1, 0) and (0, -1, -2), passes through (0, 0, 4).
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