Solve by the substitution method.0.6x + 0.4y = 1.20.7x - 0.1y = 3.1
A. {(4, -3)}
B. {(-3, 4)}
C. ?
D. {(x, y)| 0.6x + 0.4y = 1.2}
Answer: A
Mathematics
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~ 
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