7 Describe fully the geometrical transformation represented by each of the following matrices:
- \(\left( \begin{array} { l l } 6 & 0
0 & 6 \end{array} \right)\), - \(\left( \begin{array} { l l } 0 & 1
1 & 0 \end{array} \right)\), - \(\left( \begin{array} { l l } 1 & 0
0 & 6 \end{array} \right)\), - \(\left( \begin{array} { r r } 0.8 & 0.6
- 0.6 & 0.8 \end{array} \right)\).