SOLUTION: a car wash charges a flat rate for the first 8 minutes of washing time and also charges a certain amount for each additional minute of washing time. Gina took 12 minutes to wash he
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Question 451060: a car wash charges a flat rate for the first 8 minutes of washing time and also charges a certain amount for each additional minute of washing time. Gina took 12 minutes to wash her car and it cost her a total of $5.00. Kris took 17 minutes to wash his truck a total cost of $6.25.
what is the flat rate?
Answer by rwm(914) (Show Source): You can put this solution on YOUR website!
y=m(t-8)+b
5.00=4m+b
6.25=9m+b
b=4 m=.25
Flat rate for the first 8 minutes is 4 dollars
The charge per minute after 8 minutes is 25 cents
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