Show that the joint of the points (1,2,3), (4,5,7) is parallel to the join of the points (-4,3,-6),(2,9,2).

Show that the line through the points (4, 7, 8), (2, 3, 4) is parallel to the line through the points ( -1, - 2, 1) , (1, 2, 5) .

Show that the line joining the points (4,5) and (1,2) is parallel to the line joining the points (9,-2) and (12,1) .

Show that the line through the points (4, 7, 8), (2, 3, 4) is parallel to the line through the points ( 1, 2, 1) , (1, 2, 5) .

Show that the line through points (4,7,8) and 2,3,4) is parallel to the line through the points (-1,-2,1) and (1,2,5)dot

Determine the values of x and y so that the line joining the points A(x,3,1),B(1,1,-2) is parallel to the line joining the points C(2,5,3),D(-4,y,-6).

Show that the line through the point (4, 7, 8) and (2, 3, 4) is parallel to the line through the points (-1, -2, 1) and (1, 2, 5).

Show that the line joining the points (4,-1) and (-3,3) is parallel to the line joining the points (8,0) and (1,4) .

Show that the line joining the points (1,2,3), (-1,-2,-3) is perpendicular to the line joining (-2,1,5),(3,3,2).

Show that the line joining the points (4,-3) and (0,7) is perpendicular to the line joining the points (5,2) and (0,0) .

Show that the line through (4,7,8) and (2,3,4) is parallel to the line through the points (-1,-2,1) and (1,2,5).