hello. please help this math question. its from 'Lines in R3' lesson

4. State where possible vector, parametric, and symmetric equations for each of the following lines. a) The line passing through the point P(-1,2,1) with direction vector (3, -2,1) b) The line passing through the point B(-2,3,0) and parallel to the line passing through the points M(-2, -2,1) and N(-2,4,7). c) The line passing through the point Q(1,2,4) and parallel to the z-axis