The formula you need is here:
http://www.mathcentre.ac.uk/students.php/all_subjects/matrices/matrix_arithmetic/resources/56
THE INVERSE OF MATRIX
R=| 0 -1/4|
| 1 3/4|
=?
4 answers
If I did it right, it's
3 1
-4 0
3 1
-4 0
thanks
Judging by your other questions, you seem to be interested in just getting the answers, not understanding how to do the problem. In the future, I will not be responding you your posts where no work or thought is shown