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__**matrix basics **__ A matrix is a rectangular arrangement of numbers. Each number is known as an element. (1 2 3) Is a matrix of order 1x3, because it has one row and three columns. Two matrices are equal if they are of they are of the same order and their corresponding elements are the same.

To add or subtract a matrix from another matrix is very simple. Firstly, each matrix must be of the same order (so you can’t take a 3x3 matrix from a 2x2 matrix or vice versa). Then, all you need to do is add each of the corresponding elements together. subtracting matrices works in the same way (take each element from its corresponding element in the other matrix)