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berrypicking

  • 3 years ago

I need to solve using matrices. x+2y=9 and x+y=1. I know x=-7 and y=8.

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  1. irkiz
    • 3 years ago
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    I am not sure how you learnt to solve this by matrix. Have you heard of the Gaussian elimination?

  2. Mertsj
    • 3 years ago
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    Do you know Cramer's rule?

  3. berrypicking
    • 3 years ago
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    Not sure

  4. Mertsj
    • 3 years ago
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    |dw:1361848592509:dw|

  5. Mertsj
    • 3 years ago
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    Write the denominator determinant first. It is the coefficients of the x's and y's. For the x numerator, replace the x coefficients with the constants. For the y numerator, replace the y coefficients with the constants. Then evaluate the determinants.

  6. berrypicking
    • 3 years ago
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    1 -2 -1 1 is that the denom. deter?

  7. Mertsj
    • 3 years ago
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    Can you see what I posted?

  8. berrypicking
    • 3 years ago
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    i got it ended up with {-1 2 {9 1 -1} 1}==={-7,8}

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