Show that the line joining (2,-5) and (-2, 5) is perpendicular to the line joining (6,3) and (1,1).

Show that the line joining (2, -3) and (-1, 2) is perpendicular to the line joining (3, 7) and (-2, 4) .

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

Show that the line joining (2,-3) and (-5,1) is parallel to the line joining (7,-1) and (0,3).

The line joining (-5, 7) and (0, -2) is perpendicular to the line joining (1, -3) and (4, x). Find x.

Show that the line joining the points (2,-6) and (-4,-8) is perpendicular to the line joining the points (4,-2) and (6,-8) .

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) .

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) .

Show that the line joining (5, 6) and (2,3) is parallel to the line through (9, -2) and (6, -5) .

If the line joining the points (6,-2) and (8,4) is perpendicular to the line joining the points (12,8) and (24,y) , find the value of y .