Question

how do you know if two line segments are parallel? a. their slopes are equal. b. their slopes are reciprocals. c. their slopes are negative reciprocals. d. the slope of one is the negative of the slope of the other.

Explanation:

Parallel line segments (when extended to lines) have identical steepness, which means their slopes are equal. Option B describes non-perpendicular non-parallel lines, option C describes perpendicular lines, and option D describes lines that mirror over the x or y axis, not parallel ones.

Answer:

A. Their slopes are equal.