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FlyinSolo_424

  • 2 years ago

Choose the value of the y determinant (Dy) in the following system. 3x – y = 7 2x + 5y = 4

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  1. bman123
    • 2 years ago
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    are there choices

  2. FlyinSolo_424
    • 2 years ago
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    17 39 28 -2

  3. FlyinSolo_424
    • 2 years ago
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    @bman123

  4. exploringphysics
    • 2 years ago
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    what do you mean by y [dy] for the set of eq. ??

  5. exploringphysics
    • 2 years ago
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    hey @FlyinSolo_424

  6. FlyinSolo_424
    • 2 years ago
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    oh sorry. and like d (little y) instead of ^y it would be the other way

  7. FlyinSolo_424
    • 2 years ago
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    |dw:1356062104599:dw|

  8. FlyinSolo_424
    • 2 years ago
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    @exploringphysics

  9. satellite73
    • 2 years ago
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    list the coefficients without the \(y\) you get \[3,7\]\[2,4\] then \(D_y=3\times 4-7\times 2\) if i remember correctly

  10. FlyinSolo_424
    • 2 years ago
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    im confused @satellite73

  11. satellite73
    • 2 years ago
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    did you see how i got this \[3,7\]\[2,4\]?

  12. exploringphysics
    • 2 years ago
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    [3 7] [2 4] id required one can you solve this ?

  13. wio
    • 2 years ago
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    We start out with the system:\[ \begin{array}{cccc} 3x &–& y &=& 7 \\ 2x &+& 5y &=& 4 \end{array} \] We have our matrix by taking coefficients: \[ \begin{bmatrix} 3&-1\\ 2&5 \end{bmatrix} \]We have our answer column: \[ \begin{bmatrix} 7\\4 \end{bmatrix} \]We replace the y column with the answer column:\[ \begin{bmatrix} 3&7\\ 2&4 \end{bmatrix} \]Then we find the determinant:\[ 3\times 4 - 7 \times 2 \]

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