Solve the system by the substitution method.xy =12x + y =7
A. {(4, 3), (3, 4)}
B. {(4, -3), (3, -4)}
C. {(-4, 3), (-3, 4)}
D. {(-4, -3), (-3, -4)}
Answer: A
Mathematics
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A. -4 ± 
B. 4 + 
C. -4 ± 2
D. -1 ± 
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