System of equations coding problems

Hi, I'm new to Matlab and I was wondering if anyone can lead in the right direction for the solving a system of equations like the second array pictured? I've solved the first one but i'm stuck on the second. Thanks

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Star Strider
Star Strider 2018-3-20
编辑:Star Strider 2018-3-20
See the documentation on mldivide,\ (link).
n = 10;
A = full(gallery('tridiag',n,1,2,3));

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2021-8-20

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