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berrypicking
 2 years ago
I need to solve using matrices. x+2y=9 and x+y=1. I know x=7 and y=8.
berrypicking
 2 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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irkiz
 2 years ago
Best ResponseYou've already chosen the best response.0I am not sure how you learnt to solve this by matrix. Have you heard of the Gaussian elimination?

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0Do you know Cramer's rule?

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0Write 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.

berrypicking
 2 years ago
Best ResponseYou've already chosen the best response.01 2 1 1 is that the denom. deter?

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0Can you see what I posted?

berrypicking
 2 years ago
Best ResponseYou've already chosen the best response.0i got it ended up with {1 2 {9 1 1} 1}==={7,8}
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