Question 296118
Barney was charged $135.00 for 3 days and 300 miles, while Mary was charged $250.00 for 5 days and 600 miles. What does Best Rentals charge per day and per mile? 

let charge per day be $ x

& charge per mile be $ y

3x+300y =135  ( nultiply by 5 )

5x+600y= 250  ( multiply by 3) To eliminate x

3(5x+600y)-5(3x+300y) = 3*250 - 5*135

15x+1800y-15x-1500y= 750-675

300y = 75 

y=  75/300

y= 1/4 = 25 cents per mile


3x+300 *1/4 =135

3x+75=135

3x=135-75

3x=60

x= 20 

The charges are $20 per day and 25 cents per mile