The chapter helps students recall two-dimensional geometry from earlier classes. Shifting of origin, the slope of a line and angle between two lines, various forms of equations of a line including the ones parallel to the axis, point-slope form, slope-intercept form, two-point form, intercept form, and normal form are some of the topics that are being discussed in the chapter. Other concepts that the chapter covers are the general equation of a line, equation of the family of lines passing through the point of intersection of two lines, the distance of a point from a line are the topics that the students must have grasped tight by learning these concepts.