The line parallel to x-axis and passing through the origin is x-axis itself.
Let A be a point on x-axis. Therefore, the coordinates of A are given by (a, 0, 0), where a€ R.
Direction ratios of OA are (a − 0) = a, 0, 0
The equation of OA is given by,
Thus, the equation of line parallel to x-axis and passing through origin is
