Solve by the substitution method.x + 8y = 57-2x + 7y = 47
A. {(0, 8)}
B. {(-1, 8)}
C. {(1, 7)}
D. ?
Answer: C
Mathematics
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A. Yes B. No
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A. 0 B. not possible C. -30 D. 30
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A. 
B. 
C. 
D. 
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Use Gauss-Jordan row reduction to solve the system of equations.
?
?
A. 
B. 
C. 
D. 
E. 
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