To find the unit cost per marker from the graph, we can look at the two points that are marked on the line: (0, 0) and (4, 3).
The coordinates represent the following:
- At (0, 0): If you buy 0 markers, the total cost is $0.
- At (4, 3): If you buy 4 markers, the total cost is $3.
To find the unit cost, we can calculate the cost per marker by dividing the total cost by the number of markers at the point (4, 3):
\[ \text{Unit Cost} = \frac{\text{Total Cost}}{\text{Number of Markers}} = \frac{3 \text{ dollars}}{4 \text{ markers}} = 0.75 \text{ dollars per marker} \]
Thus, the unit cost from the graph is \( \text{$0.75} \) per marker.