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I am really confused, and I really don't know how they work, or how im supposed to solve them. 
Is there like a specific theory for it like adding and multiplying or are there multiple ways to solve?? 

Please help :( thanks. If anyone can explain what these are ill be really happy because i am going to have an exam on this and i really dont understand them at all 


more info is like idk how to do guassian elimination...i am not familiar with it at all and i dont know how to approach any of problems regarding this. 

 Sep 10, 2019
edited by Nirvana  Sep 11, 2019

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