The dr's of the line x = ay + b, z = cy + d are

Prove that if the lines x = ay + b, z = cy + d and x = a'y + b', z = c'y + d' are perpendiclar to each other aa' + cc' + 1 = 0.

Prove that the lines x = ay + b, z = cy + d and x = a'y + b' , z= c'y + d' are perpendicular, if a a' + c c' + 1=0

The two lines x = ay+ b , z = cy + d and x = a' y + b', z = c ' y + d' will be perpendicular, if and only if

Under which one of the following conditions are the lines x= ay + b ; z = cy + d and x = ey +f ; z = gy + h perpendicular

If the lines x = ay + b ,z = cy + d and x= a'z + b',y = c'z + d'' are perpendicular then ..........

If the equation of line is x = ay + b : z = cy +d. Then its symmetric form is

A symmetrical form of the line of intersection of the planes x= ay +b and z= cy +d is

Write the equation of the line x=ay+b,z=cy+d in symmetric from.

The cartesian equations of a line are x= ay+b,z= cy+d . Find its direction ratios.