SOLUTION: cost varies directly as time.Thecost is $8.00 when the time is 2 hours. What is the constant of proportionality?

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Question 326563: cost varies directly as time.Thecost is $8.00 when the time is 2 hours. What is the constant of proportionality?
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
c=kt

8=k(2)

k=4