Q .     The two lines `x = my + n, z = py + q` and
`x = m'y + n', z = p' y + q'` are perpendicular
to each other, if

VIT 2015
A

`mm' + pp' =1`

B

`m/m' + p/p' =-1`

C

`m/m' + p/p' =1`

D

`mm' + pp' =-1`

HINT

These equations can be rewritten as ` (x-n)/m = (y-0)/1 = (z-q)/(p)` ` (x-n')/m' = (y-0)/1 = (z-q')/(p')`

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