What is the constant of proportionality? 10. 18
36
57

 B) 18

Explanation:

x = number of packs of yogurt (column 1)

y = number of ounces of yogurt (column 2)

To get the constant of proportionality k, we divide y over x

k = y/x

k = 36/2 = 18 from row 1

k = 54/3 = 18 ... from row 2

k = 90/5 = 18 from row 3

This k = 18 value means that each time x goes up by 1, the value of y goes up by 18. This is the slope of the line y = 18x, so it represents the rate of change.

Put another way: 1 pack of yogurt is 18 ounces

i just took the test, the correct answer is .. 31.5 in.