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kfuller:
The system on the left can be reduced to: t + u = 9 9t – 9u = –9 Solving the system t=? , u=?
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Vocaloid:
as a hint - if you multiply the top equation by 9 you get 9t + 9u = 81, then you can add the two equations together to eliminate one of the variables, solve for the non-eliminated variable, then go back and substitute for the original eliminated variable
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