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what type of math class is this?

It's math team :) But it is Algebra II

I guess this is what you wanted :)
|dw:1343828412416:dw|

Wait, what? o.O I understand what you did when you did the cofactor part, but not after that.

tell me on my drawing wht didnt u understand please

|dw:1343828609211:dw|
Also, that wasn't the answer they gave?

Or was that just a part of the process?

just calculations O.o|dw:1343828726092:dw|

How does that work? o.O Sorry, I just haven't done TOO much with matrices yet...

Hmmmm....maybe I've misunderstood wht u want to find...
hang on a sec

watch inverting matrices

Wouldn't the inverse be \[\left[\begin{matrix}-2 & 1 \\ 4 & 4\end{matrix}\right]\]

Or do I multiply by the reciprocal of the determinant?

tell me smth
u want to find the inverse of the |dw:1343829407799:dw|

Would I perform this:
\[-\frac1{12}\left[\begin{matrix}-2 & 1 \\ 4 & 4\end{matrix}\right]\]

Yes. I want to find the inverse of what's above in your picture.

learnt this At Khan's videos
so jusat plug in the numbers now |dw:1343829481250:dw|

or read this...is very well explained http://dcann.myweb.uga.edu/lect08add.pdf

Isn't that what I did above?
|dw:1343829681330:dw|

yup :)

shouldnt it be |dw:1343830119553:dw|

no abs value

So it would be correct what I did?

hang on a sec pls...im on the phone

i said so...from the second link i sent u

Wait. Let me check the link...

oh wait ...-_-

I have not gone that far into matrices quite yet...haven't learned to transpose... -_-

it was as u said...sorry...it's too hot in here -_-'' I'm not thinking well :p
|dw:1343830633083:dw|

lol ok. Thanks :)

|dw:1343830704511:dw|