On a coordinate plane, plot points A, B, and C such that B is the only point AB¯¯¯¯¯ and BC¯¯¯¯¯ have in common and neither of those line segments is horizontal or vertical. Give and then follow the steps needed to construct the unique point D such that AD¯¯¯¯¯∥BC¯¯¯¯¯ and AB¯¯¯¯¯∥CD¯¯¯¯¯ . Find the slopes of those line segments, and explain how they confirm those pairs of line segments are parallel.