Solve by the substitution method.7x + 9y = 143x + 7y = 6
A. {(2, 0)}
B. {(1, 1)}
C. {(x, y)|7x + 9y = 14}
D. ?
Answer: A
Mathematics
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A. -24
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C. 
D. 
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A. 
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C. 
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Mathematics