Question

Math question

Answer 1

here, we have to write the inverse matrix of this matrix:
\[\left( {\begin{array}{*{20}{c}}
{ - 1}&4 \\
7&{ - 1}
\end{array}} \right)\]

Answer 2

Ok and then what?

Answer 3

such inverse matrix is:
\[\frac{1}{{27}}\left( {\begin{array}{*{20}{c}}
1&4 \\
7&1
\end{array}} \right)\]

Answer 4

Ohh so the answer is A?

Answer 5

yes!

Answer 6

Thanks!

Answer 7

:)