Question

Please help out with this answer

Answer 1

see below

Explanation:

Hi!

`(1)/(21-20) \left[\begin{array}{ccc}-3&10&\\2&-7&\end{array}\right]`

(Determinant is 1 in this case)

Hence the inverse is:

`\left[\begin{array}{ccc}-3&10\\2&-7&\\\end{array}\right]`