Advantage Airlines has a set fee for each checked bag, plus an additional charge for each pound the bag weighs.
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Rate of change of this function = 0.5
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refer attached picture .
The cost is a linear function of the weight
Cost = a * Weight + b
a = Rate of change of this function or Charges for Each pound
b = Constant or Set fee for each checked bag
25 = 20a + b
40 = 50a + b
=> 15 = 30a
=> a = 15/30
=> a = 1/2
=> a = 0.5
& b = 15
Rate of change of this function = 0.5
Cost = 0.5 * Weight + 15
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