This math topic focuses on determining the slope of a line that would be perpendicular to a given slope. It involves converting integer slopes to their negative reciprocal form, often resulting in fractional slopes, to find the perpendicular slope. The problems presented require understanding the relationship between a line's slope and its perpendicular counterpart (the negative inverse property). Each problem provides the slope of a line and asks learners to identify which among multiple choices is perpendicular to it. The slopes presented range from simple integers to negative integers and involve basic mathematical operations and concepts of line slopes in geometry.