Prove that the line `x/a + y/b =1 and x/b - y/a =1` are perpendicular to each other.

Show that the lines x=-y =2z " and " x+2 =2y -1 =-z +1 are perpendicular to each other .

Show that the line (x-5)/7=(y=2)/(-5)=z/1 and x/1 =y/2=z/3 are perpendicular to each other.

Show that the lines (x-5)/7=(y+2)/(-5)=z/1andx/1=y/z=z/3 are perpendicular to each other.

Show that the lines (x-5)/7=(y+2)/(-5)=z/1and x/1=y/2=z/3\ are perpendicular to each other.

If the lines x-2 = ay-3 =(2-z)/3 and bx +1 = y+4=z are perpendicular to each other, then 1/a + 1/b=

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

If the lines x−2/1=y−2/1=2 − z/k and x−1/k=4 −y/1=z−5/2 are perpendicular to each other, then the value of k is

The two lines x=ay+b, z=cy+d and x=a'y+b', z=c'y+d' are perpendicular to each other, if