Triangle abc has been rotated 90° to create triangle def. write the equation, in slope-intercept form, of the side of triangle abc that is perpendicular to segment ef. you must show all work to receive credit.

triangles abc and def are shown. a is at 4, 2. b is at 4, 5. c is at 1, 2. d is at 2, negative 4. e is at 5, negative 4. f is at 2, negative 1. line bc and line ef intersect at point 0, 1.