Identify the constant of proportionality from the graph. 9 0 15 3 A2

To find the constant of proportionality:
We can see that for every 1 unit we move to the right on the x- axis (positive), the line moves up 2 units.
Divide the change on y by that change on x:
2/1=2
The constant of proportionality is 2. (option a)