maths

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

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  1. 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.

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