GCSE Maths EDEXCEL Higher Specimen Paper 1 Q25 Perpendicular gradients

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GCSE Maths EDEXCEL Higher Specimen Paper 1 Q25 Perpendicular gradients

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sir could you just say that point c is 4, 5 because the point b is on a straight line with it so wouldn't it be 5, ?
also how do you know that it is perpendicular?
also does it matter which way round you put the a, b, c points

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