The document discusses finding the slope of a line by using the formula slope = (y2 - y1) / (x2 - x1). It provides an example of using the formula to find the slope from the coordinates (2,2) and (5,1), which is (2 - 1) / (5 - 2) = 1/-3. The document encourages the reader to memorize the slope formula as it makes finding slopes easy once learned.