The graph of function f models the specific humidity in the atmosphere, in grams of water vapor per kilogram of atmospheric gas , versus temperature, in degrees Celsius (ºC), as shown. Four of its points are labeled.
This question has two parts.
Felicia wants to model the raltionship between temperature, in ºC, and specific humidity, in . Select words to complete the statement about the type of model Felicia should use.
The relationship is _____________ because the specific humidity increases by equal ______ over equal intervals of temperature.
Which relationship must be true to justify the function type that models the relationship?