Show that the point `(1,2,3)` is common to the lines which join `A(4,8,12)` to `B(2,4,6)` and `C(3,5,4)` to `D(5,8,5)`

Show that the line joining (2, -3) and (-5, 1) is : Perpendicular to the line joining (4, 5) and (0, -2)

The coordinates of the foot of perpendicular form the point A(1,1,1) on the lline joining ponts B(1,4,6) and C(5,4,4) are (A) (3,4,5) (B) (4,5,3) (C) (3,-4,5) (D) (-3,-4,5)

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).

Show that A (3,-2) is a point of trisection of the line-segment joining the points (2, 1) and (5, -8).

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