This math topic focuses on identifying the slope of a line that is perpendicular to another given line. Students are presented with linear equations in various forms, including slope-intercept form. They must determine the slope of a line perpendicular to the one described, understanding that such a slope is the negative reciprocal of the original line's slope. The problems span from basic examples to more complex scenarios, helping students practice this fundamental concept in the study of linear equations and their properties.