To find the constant of proportionality from the graph, we need to look at how the y-values relate to the x-values.
A line that represents a relationship in proportionality can be expressed as \( y = kx \), where \( k \) is the constant of proportionality. We can calculate \( k \) using any of the points on the line.
Using the point (2, 3): \[ k = \frac{y}{x} = \frac{3}{2} \]
Using the point (4, 6): \[ k = \frac{y}{x} = \frac{6}{4} = \frac{3}{2} \]
Using the point (0, 0): \[ k = \frac{y}{x} = \frac{0}{0} \] This does not provide information about \( k \).
In all instances where we have valid \( x \) and \( y \) values, the constant of proportionality \( k \) is consistent.
Thus, the constant of proportionality is: \[ \frac{3}{2} \]
So, the correct response is: Start Fraction 3 over 2 End Fraction.