A 2x2 matrix takes the following form:
| a b |
| c d |
Its determinant is ad - b×c
The determinant of:
| 1/6 1/8 |
| -6/5 10/7 |
is [tex]\frac{1}{6}*\frac{10}{7} - \frac{1}{8}*\frac{-6}{5}[/tex]
= [tex]\frac{163}{420}[/tex]
