Answer:
Step-by-step explanation:
The constant of proportionality is the same thing as the slope when the y intercept is 0.
y1 = 27.6
y2 = 82.8
x1 =2
x1 = 6
m = (y2 - y1)/(x2 - x1)
m = (82.8 - 27.6)/(6,2)
m = 55.2/4
m = 13.8
The constant of proportionality = 13.8
