



 
Hi Shaun, I can help get you started. I would multiply the first row by 5 and add it to the second row and then multiply the first row by 1 and add it to the third row. That gives me $$\left( \begin{array}{rrrr}1 & 9 & 8 & 0\\ 0 & 37 & a & b\\0 & 13 & c & d\end{array} \right)$$ for some numbers $a, b, c, \mbox{ and }d.$ This looks quite ugly and might make you think that you will have to resort to fractions, but don't give up yet. Multiply the third row by 3 and add it to the second row. What do you get? Penny  


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