The following term, wherever used or referred to this article, shall have the following meaning, unless a different meaning is clearly intended by the context: "Persons of eligible income" shall mean persons who individually or as part of a family unit lack that amount of income which is necessary (as determined by the county executive or his designee) to enable them, without financial assistance, to live in decent, safe and sanitary dwellings without overcrowding. (1974 L.M.C., ch. 16, § 1.)