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🔍 PREVIEW MODE – Only you can see this. Back to Admin EduTek Lesson Notes Shop Print PDF Home › SS › Mathematics › Variation I SS 1 Variation I – Direct & Inverse Variation Mathematics SS 1 Third Term Introduction to Variation Variation is a mathematical concept that describes the relationship between two or more quantities. When one quantity changes, another quantity may change in a predictable way. There are several types of variation: Direct Variation: y ∝ x (y increases as x increases). Inve [Preview only]