Marvin peels potatoes at a constant rate of 2 minutes per potato.
The constant of proportionality in the image is 2 minutes per potato. This means that it takes Marvin 2 minutes to peel each potato.
I can see that you've sent me an image of a math question about proportional relationships. The question asks you to find the constant of proportionality between the number of potatoes peeled and the amount of time it takes to peel them.
To find the constant of proportionality, you can choose any two points on the line and divide the y-value (time) by the x-value (number of potatoes). For example, if you choose the points (2, 4) and (10, 20), you would get the same answer: 2 minutes per potato.
The constant of proportionality is important because it tells you how much the y-value (time) changes for every one-unit change in the x-value (number of potatoes). In this case, the time it takes to peel potatoes increases by 2 minutes for every one additional potato that Marvin peels