% Solve the following system
A=[1,-2,1,0;2,1,-3,-5;4,-1,5,17];
A
A(2,:)=A(2,:)-2*A(1,:);
A
A(3,:)=A(3,:)-4*A(1,:);
A
A(2,:)=A(2,:)/5;
A
A(3,:)=A(3,:)-7*A(2,:);
A
A(3,:)=A(3,:)/8;
A
A(2,:)=A(2,:)+A(3,:);
A
A(1,:)=A(1,:)-A(3,:);
A
A(1,:)=A(1,:)+2*A(2,:);
A