anonymous
  • anonymous
I need to solve using matrices. x+2y=9 and x+y=1. I know x=-7 and y=8.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I am not sure how you learnt to solve this by matrix. Have you heard of the Gaussian elimination?
Mertsj
  • Mertsj
Do you know Cramer's rule?
anonymous
  • anonymous
Not sure

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Mertsj
  • Mertsj
|dw:1361848592509:dw|
Mertsj
  • Mertsj
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.
anonymous
  • anonymous
1 -2 -1 1 is that the denom. deter?
Mertsj
  • Mertsj
Can you see what I posted?
anonymous
  • anonymous
i got it ended up with {-1 2 {9 1 -1} 1}==={-7,8}

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