SOLUTION: The price of a 2-hour plumbing repair job is $140 and the price of a 5-hour job is $290. Use the slope to predict the cost of a repair job lasting 4 hours.

Question 148963: The price of a 2-hour plumbing repair job is $140 and the price of a 5-hour job is $290. Use the slope to predict the cost of a repair job lasting 4 hours.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The price of a 2-hour plumbing repair job is $140 and the price of a 5-hour job is $290. Use the slope to predict the cost of a repair job lasting 4 hours.
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You have two points relating hours and cost:
(2,140) and (5,290)
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slope = (290-140)/(5-2) = 150/3 = 50
Form: y = mx + b
140 = 50*2 + b
b = 40
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EQUATION:
Cost(x) = 50x + 40
C(4) = 5*4 + 40
C(4) = $60
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Cheers,
Stan H.

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