Which of the following is the most appropriate unit to describe the rate of the cost of gasoline? dollars per gallon, because the dependent quantity is the gallons dollars per gallon, because the dependent quantity is the dollars gallons per dollar, because the dependent quantity is the gallons gallons per dollar, because the dependent quantity is the dollars

dwe

step-by-step explanation:

ewd

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: