The coefficient matrix of the given system is not diagonally dominant.
Hence, we re-arrange the equations as follows, such that the elements in the coefficient matrix are diagonally dominant.
10x+6y-z=6
6x+15y+2z=-8
x+y+25z=10
From the above equations
xk+1=1(6-6yk+zk)/10
yk+1=(-8-6xk+1-2zk)/15
zk+1=(10-xk+1-yk+1)/25
Initial guess (x,y,z)=(0,0,0)
Step. 1.
x1=0.6, y1=-77333, z1=0.4069
Step. 2.
x2=1.1046, y2= - 1.0294, z3=0.3969
Therefore solution is (1.105,-1.029,0.397
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