Answer:
See below. Slope is 3/2.
Explanation:
The left side of the graph is missing the units (the y axis). The x axis is in hours. If the y axis is labelled something such as $, the unit would be $/hour.
I attached the graph with added y axis markers and have noted two points on the graph that we'll use for calculating slope. They are (2,3) and (6,9). If the y axis had values other than what I've shown (integers from 1 to 12), then the points, and slope would differ accordingly.
Assuming the values I've marked, the slope is calculated from the Rise/Run of the line. That is, how much the y value increases (or decreases) for the corresponding change in the x value. The change in y is called the Rise and the change in x is called the Run.
Going from left to right for the two points (2,3) and (6,9):
Rise = (9-3) = 6
Run = (6-2) = 4
Slope = Rise/Run = 6/4 or 3/2