To find the unit rate depicted in the graph, we can analyze the points given: (4, 3) and (8, 6). These points represent the relationship between the minutes (x-axis) and laps (y-axis).
First, we can find the slope of the line between these two points. The formula for the slope \( m \) between two points \((x_1, y_1)\) and \((x_2, y_2)\) is:
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
Substituting in the values from the points (4, 3) and (8, 6):
\[ m = \frac{6 - 3}{8 - 4} = \frac{3}{4} \]
The slope, which is the unit rate of laps per minute, is \( \frac{3}{4} \). This means for every 1 minute, there are \( \frac{3}{4} \) laps completed.
To express this as a unit rate in terms of laps per minute:
- \( \frac{3}{4} \) laps in one minute is equivalent to 0.75 laps in one minute.
Thus, the correct answer is:
0.75 laps in one minute.