GCSE Maths - Simultaneous Equations Scaling, when the x’s or y’s are not the same coefficient. Like both being 2y or 5y. Multiply one or both equations so they do match. Same signs = takeaway (subtract) Opposite signs = plus (addition) I remember this as STOP. Find one letter, substitute back into either equation and find the other letter. Common GCSE Mistakes ❌ Forgetting to substitute back ❌ Sign errors when adding/subtracting ❌ Only solving one equation ❌ Not lining equations up properly #lea
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