To determine the constant of proportionality \( k \) from a graph, we need two points from the graph (usually defined as \((x_1, y_1)\) and \((x_2, y_2)\)). The constant of proportionality is calculated using the formula:
\[ k = \frac{y}{x} \]
- Find a point on the graph, say \((x_1, y_1)\).
- Calculate \( k \) with that point.
If you have a specific graph or points from it, please provide them, and I can help you calculate that constant of proportionality.