IGCSE 0580 syllabus, topic E2, Algebra and graphs: Use function notation, e.g. f(x) = 3x – 5, f: x ⟼ 3x – 5, to describe simple functions
IGCSE 0606 syllabus, topic 2, Functions: understand the terms function, domain and range; explain in words why a given function is a function.
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