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

Mathematics
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I am not sure how you learnt to solve this by matrix. Have you heard of the Gaussian elimination?
Do you know Cramer's rule?
Not sure

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Other answers:

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

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