To determine the constant of proportionality \( k \) from a graph where \( y \) is proportional to \( x \), you can use the formula \( k = \frac{y}{x} \).
- Identify a point (x, y) from the graph.
- Substitute the values of \( y \) and \( x \) into the formula \( k = \frac{y}{x} \).
For example, if you find that one of the points on the graph is \( (2, 6) \):
\[ k = \frac{6}{2} = 3 \]
The constant of proportionality \( k \) would be \( 3 \).
If you have specific coordinates from the graph to examine, please provide those, and I can help calculate \( k \) based on that information!