second bisector also exists, perpendicular to the first and passing through pint. Folding along this second bisector will also achieve the desired result of placing l1 onto l2. It may not be possible to perform one or the other of these folds, depending on the location of the intersection point.
If the two lines are parallel, they have no point of intersection. The fold must be the line midway between l1 and l2 and parallel to them