Functions and mappings A3.2 Extension Plenary The mapping of a onto b is a → 2a + 1 (or b = 2a + 1). What is the mapping of b onto c? What is the mapping of a onto c? Preamble Pupils are given the chance to use their mapping diagram and function writing skills in what is, for them, a novel context. Pupils will need to be systematic and consistent with their notation. They should be encouraged to share their strategies. Possible content Using and interpreting mapping diagrams, pattern spotting, using mapping notation. Resources None. Solution/Notes Mapping of b onto c: b → 2b – 1 (or c = 2b – 1) Mapping of a onto c: a → 4a + 1 (or c = 4a + 1)