[First year linear algebra] What is the value of a?



[Any help is greatly appreciated! If you could explain to me how you can get the value that would be amazing. Thank you](https://preview.redd.it/0o7mk9ws7fn51.png?width=1869&format=png&auto=webp&s=4b9c25d0e9a70f720099af5074fb93b12d8fc2fc)



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