Prove parallel lines have the same slope. use lines r and s. line s is a vertical transition of line r. (a) a translation is a rigid transformation. how does this statement support line s being parallel to line r? (b) write an expression for the slope of line r. (c) write an expression for the slope of line s. (d) line q is a vertical translation of line s 3 units down. is the image of . what are the coordinates of ?