Cydney is proving that perpendicular lines have slopes that are opposite reciprocals. she draws line p and labels two points on the line as (0, a)(0, a) and (b, 0)(b, 0) . enter the answers, in simplest form, in the boxes to complete the proof. the slope of line p is . rotate line p 90° counterclockwise about the origin to get line q. the labeled points on line p map to (−a, 0)(−a, 0) and ( , ) on line q. the slope of line q is . the slopes of the lines are opposite reciprocals because the product of the slopes is .