This math topic covers finding lines perpendicular to given ones and converting graph representations into slope-intercept forms. It mainly hones skills in understanding and using the slope concept, specifically focusing on perpendicular slopes and how to manipulate and determine them based on given line equations. Each problem consists of a graph depicting a line, and the task is to select or write an equation for a line that is perpendicular to the shown line. The questions provide multiple choice expressions and require analyzing the slope relationships between lines.