find the inverse of matirx m= 2 1
-1 3
is it 3 -1
1 2
and how dod i find the value of and a y for which ma is x and y
If you multiply
2 1
-1 3 by
3 -1
1 2 you get
7 0
0 7
So divide each of the entries in your inverse matrix by 7
in general for the inverse of
a b
c d
you would have
d -b
-c a with each term divided by (ad-bc)
1.