Change of Subject of a Relation Introduction In algebra, you often meet formulas where one quantity depends on others — like A = πr^2 A = π r 2 or v = u + a t But sometimes, you’re asked to make another letter the subject . For example, instead of A = π r 2 A = πr^2 A = π r 2 , you might need to make r the subject. This process is called “Change of Subject of a Relation.” It simply means rearranging a formula so that one specific variable stands alone on one side of the equation- usually the left-hand side. What It Means If we have an equation: y = 3 x + 2 and we want to make x the subject , it means we must rewrite it as: x = something in terms of y It’s like solving for x x — isolating it by performing the same operatio...
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