This math topic focuses on identifying slopes that are perpendicular to given graphed lines. It involves understanding how to determine the slope of a line from a graph and then calculating the perpendicular slope, which involves taking the negative reciprocal. The problems presented here are diverse, covering different line orientations and providing multiple choice answers, which include the correct perpendicular slopes expressed in fractions or whole numbers. This topic is part of an introductory unit on slopes and perpendicular lines, emphasizing foundational skills in graph analysis and slope calculations.