This math topic covers finding line equations that are perpendicular to a given slope, focusing on transforming a decimal slope to the slope-intercept form. The main skill practiced is identifying the slope that is perpendicular to a given slope, either as a whole number or a decimal, and then formulating the corresponding line equation in y-intercept form. The problems provide multiple equations for students to choose the correct perpendicular slope from various options, enhancing their understanding of slopes and perpendicular lines within coordinate geometry.