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OpenStudy (anonymous):
I need to solve using matrices. x+2y=9 and x+y=1. I know x=-7 and y=8.
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OpenStudy (anonymous):
I am not sure how you learnt to solve this by matrix. Have you heard of the Gaussian elimination?
OpenStudy (mertsj):
Do you know Cramer's rule?
OpenStudy (anonymous):
Not sure
OpenStudy (mertsj):
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