To find the slope (m) of the line, we can use two points on the line such as (3,1) and (6,2):
m = (y2 - y1) / (x2 - x1)
m = (2 - 1) / (6 - 3)
m = 1 / 3
Now that we have the slope, we can write the equation of the line in slope-intercept form:
y = mx
So, the equation of the line y = (1/3)x describes the proportional relationship shown in the graph.