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Determine the missing information in the paragraph proof. Given: Line PQ is rotated 90° counterclockwise to form line P’Q’. The lines are perpendicular. Line PQ contains the points (a, b) and (c, d). Line P’Q’ contains the points (–b, a) and (–d, c). Prove: The slopes of perpendicular lines are negative reciprocals. The slopes of lines PQ and P’Q’ can be determined using the formula The product of these slopes is ________. This product shows that the slopes are negative reciprocals. It is given that the lines are perpendicular and we have shown that the slopes of the lines are negative reciprocals.