Final answer:
The equation to represent the total cost, y, for x number of gallons of gasoline priced at $3.39 per gallon is y = 3.39x.
Step-by-step explanation:
The question asks us to write an equation that represents the total cost, y, of purchasing x number of gallons of gasoline, given that the price per gallon is $3.39. The equation to represent this is a simple linear equation based on the formula: total cost = price per gallon × number of gallons.
To write the equation, we would set it up as follows:
y = 3.39x
Here, y represents the total cost in dollars, and x represents the number of gallons of gasoline purchased.