To determine the year when the price per bag of cookies was $4, you'll need to analyze the graph. Look for the point where the y-value (price) equals $4. Once you identify that point, you can see which year it corresponds to on the x-axis.
If the graph shows that the price reaches $4 in any specific year, that is your answer. Without seeing the graph, I can't provide the exact year, but typically you would locate the y-value of 4 on the vertical axis and then follow this horizontal line to see where it intersects with the graph. The corresponding x-value will give you the year when the price was $4.
If you can provide me with details about the graph, I can help you interpret it more specifically!