This math topic focuses on identifying line equations that are perpendicular to given line equations. It involves converting line equations from standard form to slope-intercept form and then determining the equation of a perpendicular line. The questions provide a line equation in standard form (e.g., 2x + 2y = 2), and students are asked to select which of the multiple-choice line equations would have a slope perpendicular to the slope of the given equation. This topic requires understanding the relationship between slopes of perpendicular lines and converting between different forms of line equations.