Find the equation of a line parallel to x-axis and passing through the origin
Answer»
Answer :The direction cosines of the x-axis are 1, 0, 0. THEREFORE we any ASSUME the direction ratios of the REQUIRED line as 1, 0, 0. Since it PASSES through the origin, the required equation is `(x-0)/1 = (y-0)/0 = (z-0)/0`