The document discusses finding the equation of a line using two points and includes examples of finding the equation of lines passing through points (0,3) and (4,19), (2,7) and (4,13), and (-2,6) and (4,-18). It also provides examples of determining if a point lies on a given line and finding the x-intercept of lines with equations y=3x-7 and 2x+3y=15.