To determine the relationship between the number of eggs \( y \) and the amount of flour \( x \), we start with the information given: for every 3 cups of flour, you need to add 2 eggs.
This can be modeled with the equation:
\[ y = \frac{2}{3}x \]
Here, \( \frac{2}{3} \) represents the constant of proportionality, meaning for every 3 cups of flour, there are 2 eggs.
This situation is proportional because as flour increases, the number of eggs increases at a constant rate.
So, the correct response is:
y = \(\frac{2}{3}\)x, proportional.