This video involves equations of lines that are parallel or perpendicular to a given line, using slope-intercept (y=mx+b) form. Topics include: finding the equation of a line given a point on the line and a line that is parallel to it, and finding the equation of a line given a point on the line and a line that is perpendicular to it. George Woodbury is an author who teaches at College of the Sequoias in Visalia, CA.