Originally Posted by

**watchmath** In my opinion people won't response your question. The main reason is that it is messy to right matrix in latex.

That is a possibility...but there is a neat way of creating matrices without using

Code:

\left[\begin{array}{cccc} [insert matrix here] \end{array}\right]

You can use

Code:

\begin{bmatrix} [insert matrix entries here] \end{bmatrix}

This saves me a lot of time.

For example, instead of using

Code:

\left[\begin{array}{cccc} 1&0&0&0\\0&1&0&0\\0&0&1&0\\0&0&0&1 \end{array}\right]

to generate , you can use

Code:

\begin{bmatrix}1&0&0&0\\0&1&0&0\\0&0&1&0\\0&0&0&1 \end{bmatrix

to generate

The second one elimination problem is kind of routine so no body has no interest to answer.

It may be this, or just that using eliminations on this will lead to ugly looking fraction elements!!! [as seen in my response to part a)]

--Chris