Problem 10 of 7.3 a system of linear equations

This link is the educrational video Walter, kelvin and I made together to show you how to solve a set of linear equations!

Have fun

https://www.edmodo.com/link?message_id=190911285&id=33951747&url=http%3A%2F%2Fwww.educreations.com%2Flesson%2Fview%2Fproblem-10%2F15470304%2F%3Fs%3DhlG2Dz%26ref%3Dapp