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berrypicking

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

  • one year ago
  • one year ago

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

    • one year ago
  2. Mertsj
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    Do you know Cramer's rule?

    • one year ago
  3. berrypicking
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    Not sure

    • one year ago
  4. Mertsj
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    |dw:1361848592509:dw|

    • one year ago
  5. Mertsj
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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.

    • one year ago
  6. berrypicking
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    1 -2 -1 1 is that the denom. deter?

    • one year ago
  7. Mertsj
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    Can you see what I posted?

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

    • one year ago
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