how can i solve this ?

a code for gauss-jacobi and gauss-seidel (in one m-file, using switch case , press 1 for gauss-jacobi and 2 for gauss-seidel ) methods to solve the following system until the percent relative error falls below 0.001

-3x11-6x2+2x3=-61.5
10x1+2x2-x3=25
x1+x2+5x3=-21.5

Answer 1

[Roger Stafford]

You could use matlab's 'ldivide' (back-slash) operator. (I assume the first equation was meant to be "-3x1-6x2+2x3=-61.5" with x1 replacing x11.)

   A = [-3,-6,2;10,2,-1;1,1,5];
   b = [-61.5;25;-21.5];
   x = A\b;

The elements of x will be solutions for x1, x2, and x3.

Solving linear equations like this is what matlab is all about.