Answer:
Proportion states that the two ratios or fractions are equal.
Here, y represents the cost of x ounces of blueberries.
As per the given statement:
A fruit stand sells 8-ounce containers of blueberries for $4.00.
then by definition of proportion we have;

By cross multiply we get;

Divide both sides by 8 we get;

or

Therefore, the equation that correctly models this proportional relationship is, y = 0.5x