How do you enter a problem in matrix format?

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* If you want to solve a system of linear equations you can use wolfram|Alpha, for example:To Solve this system of linear equations (2 equations and 2 variables ){2x+y=1 , x+y=2} you can do it using wolfram|Alpha, like this:Just enter:{2x+y=1 , x+y=2} or clic the next link System of linear equations