To find the constant of proportionality, we need to find the ratio of cups of flour to loaves of bread for the provided data points. The ratio should remain constant if the relationship is proportional.
The relationship is given by the recipe: 2 cups of flour per loaf.
From the table:
- For 1 cup of flour, they can make 12 loaves. This gives us the ratio \( \frac{1}{12} \).
- For 2 cups of flour, they can make 1 loaf. This gives us the ratio \( \frac{2}{1} \).
- For 3 cups of flour, they can make 112 loaves. This gives us the ratio \( \frac{3}{112} \).
- For 4 cups of flour, they can make 2 loaves. This gives us the ratio \( \frac{4}{2} \) or \( 2 \).
The only ratio that shows a direct relationship to the recipe’s requirement of 2 cups per loaf of bread is \( (4, 2) \).
Thus, the ratio in the data table where the constant of proportionality appears is:
(4, 2)