Question 313639
For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation? 
2x + y = 9
−x − y = −8
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Solve 2nd equation for "x":
x = 8-y
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Cheers,
Stan H.
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−8 + y 
−8 − y 
8 + y 
8 − y