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Most free notes online are written by someone. These are written by the person marking the exam.

Generic revision sites copy-paste the same explanations everyone else uses, or hand you an anonymous PDF with no context for what actually earns marks. These notes are written specifically in the style Mr Moussally uses with his own students — and he is an active Edexcel examiner who marks the real paper. Every topic gets the same treatment: a clear explanation, a worked example, his own tip, and the one mistake he sees most.

3.1 LINEAR GRAPHS
A line has gradient 3 and passes through (0, 4). Here is the thing — once you see it, you will wonder why it was hard: just substitute straight into y = mx + c.
💡 Mr Moussally's Tip
Write the gradient and intercept down first, before touching the equation. It stops silly sign errors.
❌ Common Mistake
Mixing up the x and y coordinates when substituting — always check which one goes where first.

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