To find the unit rate, which is the number of copies per minute, we can analyze the graph by identifying how many copies the copier makes in one minute.

Step-by-Step Solution

1. The graph shows a linear relationship between time (in minutes) and the number of copies made.
2. By observing the graph, at $t = 1$ minute, the copier has made approximately 15 copies.
3. This rate remains consistent over time, as seen by the linear increase.

Thus, the unit rate, or the number of copies made per minute, is 15 copies per minute.

Answer

The correct answer is C. 15 copies per minute.

Would you like more details on this solution or have any questions?

Here are some related questions to deepen understanding:

1. How would the unit rate change if the copier speed doubled?
2. What would the unit rate be if the copier made only 10 copies in the first minute?
3. How can you calculate the unit rate if you have non-linear data?
4. What is the significance of a unit rate in real-life scenarios?
5. How can you interpret unit rates from a table instead of a graph?

Tip: When analyzing unit rates, look for consistent intervals on graphs to confirm linear relationships.