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 :

Question

$aa' + cc' + 1 = 0$

$aa' + bb'cc' + 1 = 0$

$aa' + bb'cc' = 0$

$\left( {a + a'} \right)\left( {b + b'} \right) + \left( {c + c'} \right) = 0$

Please login to view the detailed solution steps...