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Jonask

  • 3 years ago

matrices

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  1. Jonask
    • 3 years ago
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    \[x_1+2x_2+x_3=5\] \[4x_1+7x_2+8x_3=9\] \[2x_1+3x_2+5x_3=1\] a) write the system in a matrix multiplication AX=Y

  2. Jonask
    • 3 years ago
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    is it \[\left[\begin{matrix}1 & 2 &1\\ 4 & 7& 8\end{matrix}\right]\left[\begin{matrix}x_1 \\ x_n\end{matrix}\right]=\left[\begin{matrix}5 \\ 9\\1\end{matrix}\right]\]

  3. nubeer
    • 3 years ago
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    hmm you missed one rown in the end in the A matrix.

  4. nubeer
    • 3 years ago
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    @Jonask

  5. UnkleRhaukus
    • 3 years ago
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    \[\left[\begin{matrix}1 & 2 &1\\ 4 & 7& 8\\2&3&5\end{matrix}\right]\left[\begin{matrix}x_1 \\ x_2\\x_3\end{matrix}\right]=\left[\begin{matrix}5 \\ 9\\1\end{matrix}\right]\]

  6. Jonask
    • 3 years ago
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    oh yes thank you how do we find the det(A) Adj(A)

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