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...Matrix algebra addition and scalar multiplication twomatrices of the same size are added by adding their corresponding entries for instance two matrices that not is undened a multiplied i e number multiplying each entry one could dene way we dened just multiply however dif ferent more relevant linear forming various dot products between rows rst columns second its horizontal lists numbers vertical example first product only if here as also put another sizes displayed indicated cols then inner blue need to match in this case resulting has given outer compute say nd row st column take with general ith jth these make sense vectors must have components matrixalgebra following solution since do so outside middle step can be skipped allows us write system equations single equation x written or using letters ax b where checked on left get saying equal which what original says...