For what value of x is line a parallel to line b? Enter your answer in the box. x = horizonal lines a and be are cut by a transversal. where line a and the transversal intersects forms 4 angles. the top left angle is labeled as (5 x plus 15) degrees. where line b and the transversal intersects forms 4 angles. the top left angle is labeled 115 degrees. the angle below it is labeled 65 degrees.