To identify the constant of proportionality from a graph, you typically need to look at the relationship between the two variables represented on the graph (often plotted as \( y \) vs. \( x \)). The constant of proportionality (k) can be determined by the formula:
\[ k = \frac{y}{x} \]
If you can provide the specific points represented in the graph or a description of it (such as coordinates of points), I can help you find the constant of proportionality accurately.