Hello -

I have solved the following for x1 and x2 with z = 0.005 for b1=1 and b2=3. then again for b1=1.1 and b2=3. The answers vary by quite a bit for such a small change (0.5 to -2.495). can anyone tell me why this would be? thanks!

$\displaystyle

\begin{bmatrix}

1+3z & 1-3z \\

3-z & 3+z \end{bmatrix}

\begin{bmatrix}

x1 \\

x2 \end{bmatrix}

=

\begin{bmatrix}

b1 \\

b2 \end{bmatrix}

$