According to automobile association of a country, on March 27, 2009, the national average price per gallon of regular unleaded (86-octane) gasoline was $2.02, and the price of premium unleaded (91-octane) gasoline was $2.26. The cost of the blend of mid-grade unleaded gasoline (90-octane). Select a graph of the region determined by the constraints.
?
Constraints:
?
x ? 0
y ? 0
x + y = 1
86x + 91y = 90
?
A. 
B. ?
C. 
D. 
E. ?
Answer: C
Mathematics
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÷ 5 ? 
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