This math topic focuses on finding the slope of lines that are perpendicular to given slopes. It involves computing the negative reciprocal (also known as the negative inverse) of a given slope, which is essential for determining perpendicularity in the context of linear equations. The problems present various integer and decimal slopes and ask for the perpendicular slope, refining skills in handling negative and reciprocal calculations in both formats. This practice is part of a broader unit on slopes and perpendicular lines.