Sarah is renting a car for her weekend trip to the mountains. The total cost of the rental, f(x), as it relates to the number of
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The point-slope form: 
m = -1; (2; 4)
subtitute
y - 2 = -1(x - 4)
m = -1; (2; 4)
subtitute
y - 2 = -1(x - 4)