Use a graphing calculator to solve the system. Express solutions with approximations to the nearest thousandth.
x -y = 7100x + y = 9
A. {(0.157, -6.686)}
B. {(0.154, -6.444)}
C. {(0.158, -6.777)}
D. {(0.020, 6.971)}
Answer: C
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A. 
B. 
C. 
D. 
E. 
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