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In this video I explain how to add, and subtract matrices, how to multiply a matrix by a
scalar (a number) and how to multiply two matrices. In order to do operations with matrices,
they must be conformable. Two matrices are conformable for addition and subtraction if they
have the same number of rows and columns and they are conformable for multiplication if the
number of columns of the first is equal to the number of rows of the second. I worke out
several examples.