Can direction ratios be negative

Yes, direction ratiOS can be negative. Direction ratiOS are proportional values that represent the direction of a line in space, and they can be any real numbers, including negative values. The sign of the direction ratiOS indicates the orientation of the line, but the actual direction is determined by the ratiOS' relative magnitudes rather than their individual signs. Thus, a line can have direction ratiOS like (-1, 2, 3) while still pointing in a valid direction.