Final answer:
The given information is not directly proportional. There is no equation of proportionality to find.
Step-by-step explanation:
The given sets of values for X and Y are:
X: 4, 6, 8, 10...
Y: 5, 7.5, 9, 11.5...
To determine if they are directly proportional, we need to check if the ratio Y/X is constant.
Let's calculate the ratios for the given values:
Ratio for X = 4: 5/4 = 1.25
Ratio for X = 6: 7.5/6 = 1.25
Ratio for X = 8: 9/8 = 1.125
Ratio for X = 10: 11.5/10 = 1.15
Since the ratio Y/X is not constant, the given information is not directly proportional.
Therefore, there is no equation of proportionality to find.