# Matrix "hence" question?

Basically I have this matrix question.

I succeeded in the first part, and the answers match.

x= (1/22)(a-3b+11c),

y=(1/22)(5a+7b-11c)

z=(1/22)(-13a-5b+11c)

Now the problem really arises from the Hence part.

It also says "otherwise", so I simply found the inverse using the Adjoint method.

However I am curious, what did I miss?

How can I use the results of x y and z to find the inverse?

I do realize that the equations can form the given matrix.

Relevance
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Lv 7
6 years ago