(107,97.15),(127,106.15)
slope = (106.15 - 97.15) / (127 - 107) = 9 / 20 = 0.45
y = mx + b
slope(m) = 0.45
(107,97.15)....x = 107 and y = 97.15
sub into the formula and find b, ur flat rental fee
97.15 = 0.45(107) + b
97.15 = 48.15 + b
97.15 - 48.15 = b
49 = b <== ur flat rate fee
so ur equation would be : y = 0.45x + 49....this is basically saying that the cost of renting a van will cost u $ 0.45 per mile with the flat rate fee costing u $ 49.
