Solve by the substitution method.x + y = 3x + y = -1
A. {(x, y)|x + y = -1}
B. {(3, -1)}
C. ?
D. {(0, 2)}
Answer: C
Mathematics
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Suppose that the cost C (in dollars) of removing p percent of the particulate pollution from the smokestacks of an industrial plant is given by 
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?
A. 
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E. 
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