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

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) .

The straight line joining (1, 2) and (2, -2) is perpendicular to the line joining (8, 2) and (4, p). What will be the value of p?

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 joining (2,-3) and (-5,1) is (i) parallel to the line joining (7,-1) and (0,3) (ii) perpendicular to the line joining (4,5) and (0,-2)

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 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 (-1,1) and (-9,6) are parallel to the line joining (-2,14) and (6,9).