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Mathematics 15 Online
OpenStudy (anonymous):

HELP! Matrices! See attachment..

OpenStudy (anonymous):

\[\left[\begin{matrix}-7 & 2 \\ 11 & -3\end{matrix}\right]\left(\begin{matrix}x \\ y\end{matrix}\right)\left(\begin{matrix}-2 \\ -5\end{matrix}\right)\]

OpenStudy (christos):

Where is the attachment

OpenStudy (anonymous):

I meant the comment. That's what I need to solve.

OpenStudy (loser66):

you have formula to do it, Ax =b--> x = A^- b. just find out A^-

OpenStudy (anonymous):

Idk how..

OpenStudy (loser66):

\[A^= \frac{ 1 }{ ad-bc }\left[\begin{matrix}d & -b \\ -c & a\end{matrix}\right]\]

OpenStudy (loser66):

|dw:1367936665230:dw|compute it first, and tell me what you get

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