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### Question Asked by a Student from EXXAMM.com Team

** Q 1563234145. ** 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 **

#### 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')`