How to solve a 5x5 matrix in Matlab?

Hello, I have a 5x5 matrix and I wanna slove it...Any help please?

Thank you !

A=[1 1 -1 4 5 ; 0 1 3 5 6 ; -1 0 -2 8 7 ]

b=[9;3;2;6;7]

[Walter Roberson]

That looks like a 3 x 5 matrix for A, not a 5 x 5.

[Ahmed Saeed Mansour]

I am sorry, you are right, here is the correct matrix:

A=[300 -100 0 0 0 ; -100 200 -100 0 0 ; 0 -100 200 -100 0; 0 0 -100 200 -100; 0 0 0 -100 300 ]

b=[20000;0;0;0;80000]

A\b

And after reading the answers here, I got the solution, thank you so much !

Answer 1

[Walter Roberson]

A\b

Answer 2

[the cyclist]

A\b

Take a look at this documentation. Does that do what you want?

[Ahmed Saeed Mansour]

Thank you very much, it is very helpful !