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AQA D1 Linear programming guide?

Does anyone know of a website or a guide which I can use to get better at linear programming, I'm somewhat okay at constraints, but I can't find maximum profit/minimum cost when a graph has more than 3 lines as I don't know what to do. I've been using the textbook but it only has easy worked examples then gives more challenging mixed exercise questions, thanks
Try HegartyMaths! Explains D1 really well.

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