[maybewhenthesun]

I actually really liked the gaussian elimination part. It's a term you hear often and 'demystifying' it is good imho.

Only nitpick I have is that it's a pity you use only 1 and 2 in the example with the carbs. Because of the symmetry it makes it harder to see which column/row matches which part of the vector/matrix because there's only 1s and 2s and it fits both horizontally and vertically...