Notice of lay-off and a copy of this article shall be given to the teacher by registered mail no later than the first day of May of any school year. The teacher, within ten teaching days of receiving notice of lay-off, shall indicate in writing of his/her wish to be placed on the re-employment list. Notwithstanding anything else in this article, failure to respond within the time limit specified in this paragraph shall relieve the onus on the Division for that teacher's placement on the re-employment list and the teacher shall lose seniority.