Question 662251
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Hi,
costs varies linearly with the distance 
(1500,510)
 (300,366)  m = (510-366)/(1500-300) = 144/1200 = 12/100 = .12
y = .12x + b
510 = .12*1500 + b
330 = b
f(x) = .12x + 330
 .12x + 330 <$600
     .12x < 270
        x < 2250mi
slope represents the constant of increase cost/mi
b = $330 relates to the basic cost of owning a vehicle
f(500) = $390
f(1000) = $450
f(2000) = $570