If the line joining the points `A(2,3,-1)` and `B(3,5,-3)` is perpendicular to the line joining the points `C(1,2,3)` and `D(3,y,7)` then `y=`

Show that the line joining the point A(1,-1,2) and B(3, 4, -2) is perpendicular to the line joining the points C(0,3,2) and D(3,5,6).

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) .

Line joining the points (3,-4) and (-2,6) is perpendicular to the line joining the points (-3,6) and (9,-18).

Determine the value of k so that the line joining points A(k,1,-1) and B(2,0,2k) is perpendicular to the line joining the points C(4,2k,1) and D(2,3,2) .

The line joining the points (2, x) and (3, 1) is perpendicular to the line joining the points (x, 4) and (7, 5). The value of x is

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 straight line joining the points (-1,0,-2) and (1,3,-1) is perpendicular to the straight line joining the points (9,1,-6) and (7,2,-5)

If the line joining the points (k,2,3),(1,1,2) is parallel to the line joining the points (5,4,-1),(3,2,-3) then k=

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).