This document discusses how to calculate the slope of a line from two points on the line. It provides the formula for slope as the rise over the run, or (y2 - y1) / (x2 - x1). Several examples are worked through, finding the slopes of lines passing through different pairs of points. The key points are: - Slope is the ratio of the vertical change (rise) to the horizontal change (run) between two points - The formula to calculate slope from two points (x1, y1) and (x2, y2) is: (y2 - y1) / (x2 - x1) - Slope can be positive, negative, zero