?Gas costs $3.10 a gallon. Which of the following represents the function that expresses the independent variable as a function of the dependent variable?
?
A. ?x = 3.1y, where y is the independent variable and x is the dependent variable.
B. ?y = 3.1x, where x is the independent variable and y is the dependent variable.
C. ?y = 3.1x, where y is the independent variable and x is the dependent variable.
D. ?y = 3.1, where y is the independent variable and the dependent variable.
E. ?None of the above.
Answer: B
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