do you mean 28 inches by 9 inches by 18 inches? That is 28+9+18 = 55 linear inches by airplane luggage standards
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16 columns exactly fit into the measurement of 56 inches.
3.6 feet (not fit!) equals 43.2 inches
It all depends on the other dimensions of the suitcase and also of the trunk. To illustrate this I am going to use some unlikely dimensions. But they should show that you cannot give a proper answer with only partial information. Suppose the 22" suitcase has a height of 8 inches. Suppose the 9 cubic foot trunk has dimensions 36 feet*6inches*6inches ie a long narrow trunk. Then you will not get even a single suitcase in.
No, I don't think that would fit the definition of a linear function.