FP1 - Inverse matrices
I'm retaking fp1, as it seemed sensible since im doing fp2 aswell this year, and im now about to embark on re-doing fp1 matrices. They're about as nice as i remember, but i'm very confused about the inverse matrix. More over, i dont understand how they get to the formula. If anybody knows of an a-level friendly proof, could they please show me? I like to know where things come from 
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