Hello tutors by any chance is there anyone who can assit me with theprevious problems that i posted..dealing with math subject

Question

Here is a website explaining how to invert a 3x3 matrix.

http://www.everything2.com/index.pl?node_id=1271704

Many steps are involved and I cannot show you any shortcuts. An inverse matrix exists when the determinant of the original matrix is non-zero, which is true in your problem.

Look at the method I had suggested to your posting from 3:13pm below
It is different from the method suggested in the link supplied by drwls.