This topic focuses on determining the slope of a line that is perpendicular to a given line with a specific slope expressed in decimal form. The skill practiced involves understanding the relationship between slopes of perpendicular lines: specifically, the concept that the product of the slopes of two perpendicular lines is -1, leading to the calculation of the negative reciprocal. Each problem provides a slope and requires selecting the correct perpendicular slope from a set of options, enhancing comprehension of linear equations and their geometric interpretations in the context of slopes and perpendicular lines.