SOLUTION: Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $90.00 for 3 days and 300 miles, while Mary was charged $162.00 for 5 days and 600 mil

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Question 1132965: Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $90.00 for 3 days and 300
miles, while Mary was charged $162.00 for 5 days and 600 miles. What does Best Rental charge per day, for mileage?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x miles
b daily fee
y=mx%2Bbcost

The two described cost equations would be
system%2890=%28m%29%28300%29%2B3%2Ab%2C162=%28m%29%28600%29%2B5b%29
Simplify and solve the system for m and b.
(Or you might want to first solve for b by elimination.)

--

system%28300m%2B3b=90%2C600m%2B5b=162%29

system%28600m%2B6b=180%2C600m%2B5b=162%29

E1-E2
highlight%28b=18%29----------daily fee
.
.