To compare the cost per ounce of canned corn from Store A and Store B, we need to evaluate the points from Store A's graph and the equation for Store B.
Store A's cost per ounce can be determined from the plotted points:
- At \( x = 0 \) ounces, the cost \( y = 0.00 \) dollars.
- At \( x = 8 \) ounces, the cost \( y = 0.80 \) dollars, so the cost per ounce is \( \frac{0.80}{8} = 0.10 \) dollars per ounce.
- At \( x = 15 \) ounces, the cost \( y = 1.50 \) dollars, so the cost per ounce is \( \frac{1.50}{15} = 0.10 \) dollars per ounce.
- At \( x = 30 \) ounces, the cost \( y = 3.00 \) dollars, so the cost per ounce is \( \frac{3.00}{30} = 0.10 \) dollars per ounce.
From the above evaluations, Store A's price per ounce is consistently \( 0.10 \) dollars.
Now, for Store B, the cost per ounce can be calculated using the equation \( y = 0.13x \). This equation directly gives the cost based on the number of ounces purchased.
For different values of \( x \):
- For \( x = 8 \) ounces, the cost is \( y = 0.13(8) = 1.04 \) dollars, cost per ounce = \( \frac{1.04}{8} = 0.13 \) dollars per ounce.
- For \( x = 15 \) ounces, the cost is \( y = 0.13(15) = 1.95 \) dollars, cost per ounce = \( \frac{1.95}{15} = 0.13 \) dollars per ounce.
- For \( x = 30 \) ounces, the cost is \( y = 0.13(30) = 3.90 \) dollars, cost per ounce = \( \frac{3.90}{30} = 0.13 \) dollars per ounce.
Now, we compare the two stores:
- Store A: \( 0.10 \) dollars per ounce.
- Store B: \( 0.13 \) dollars per ounce.
Conclusion: Store A has the better buy, as its cost per ounce is lower by:
\( 0.13 - 0.10 = 0.03 \) dollars per ounce.
Therefore, Store A is better by 0.03 dollars (3 cents) per ounce.