Translate the problem to a system of equations; then solve using the elimination method.A merchant has coffee worth $4 a pound that she wishes to mix with 2 pounds of coffee worth $9 a pound to get a mixture that can be sold for $6 a pound. How many pounds of the $4 coffee should be used?
A. 3 lb
B. 2.5 lb
C. 1.5 lb
D. 5 lb
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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Fill in the blank(s) with the appropriate word(s).
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Mathematics