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anonymous

  • one year ago

Question 38 of 165 Solve the system of linear equations below. 2x + y = 5 x + y = 4 x = 1, y = 3 x = 1, y = 5 x = 3, y = 1 x = 9, y = -5

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  1. anonymous
    • one year ago
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    you can subtract the two equations, then the y term will disappear and then you can find x

  2. anonymous
    • one year ago
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    \[\left[\begin{matrix}2 & 1 \\ 1 & 1\end{matrix}\right]\left[\begin{matrix}x \\ y\end{matrix}\right]=\left[\begin{matrix}5 \\ 4\end{matrix}\right]\]\[|A| = (2 \times 1) - (1 \times 1 ) = 1\]\[A ^{-1} = \left[\begin{matrix}1 & -1 \\ -1 & 2\end{matrix}\right]\]\[\left[\begin{matrix}1 & -1 \\ -1 & 2\end{matrix}\right]\left[\begin{matrix}5 \\ 4\end{matrix}\right]=\left[\begin{matrix}? \\ ?\end{matrix}\right]\]

  3. anonymous
    • one year ago
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    so....its....

  4. anonymous
    • one year ago
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    do the matrix multiplication and find out :)

  5. anonymous
    • one year ago
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    and that is....

  6. anonymous
    • one year ago
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    answer isnt that important its how you get there

  7. anonymous
    • one year ago
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    noo im saying whats matrix multiplication

  8. anonymous
    • one year ago
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    x=1 y=5

  9. anonymous
    • one year ago
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    |dw:1438777722519:dw|

  10. anonymous
    • one year ago
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    im on question 103 now so....

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spraguer (Moderator)
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