Final answer:
The constant of proportionality from m to j in the equation j = km is k. It defines how much j changes for a unit change in m and maintains this ratio regardless of their specific values.
Step-by-step explanation:
The proportional relationship between the variables j and m, represented by the equation j = km, indicates a directly proportional relationship. Here, k is the constant of proportionality, which tells us how much j changes with a change in m. For every unit increase in m, j increases by a factor of k. The value of this constant remains the same no matter what the values of j and m are as long as they maintain the proportional relationship.
To give an example, if k was 2, this would mean that for every 1 unit increase in m, j would increase by 2 units. This relationship would be represented graphically as a straight line through the origin (0, 0). The slope of this line, which is calculated as the change in j over the change in m, would equal the constant k.