1) The document provides examples of writing equations of lines in slope-intercept form that are parallel or perpendicular to given lines and pass through given points. 2) The examples show finding the slope of the given line, determining if the required line is parallel or perpendicular, setting up the equation in slope-intercept form using the appropriate slope, and solving for the y-intercept. 3) Common steps are finding the original slope, calculating the parallel or perpendicular slope, and substituting points into the line equation to solve for the y-intercept.