Identify any relationships that exist among the lines. (Select all that apply.) (a) y = 8x (b) y = -8x (c) y = x (a) is parallel to (b) O (b) is parallel to (c) O (a) is parallel to (c) O (a) is perpendicular to (b) (b) is perpendicular to (c) (a) is perpendicular to (c)