Homework Help: Math, I NEED HELP.c:

Posted by Izzy. on Thursday, January 5, 2012 at 10:06pm.

A rental company charges a flat fee of x dollars for a floor sander rental plus y dollars per hour of the rental. One customer rents a floor sander for 4 hours and pays $63. Another customer rents a floor sander for 6 hours and pays $87. Find the flat fee and the cost per hour for the rental and how much it would cost if someone wanted to rent a sander for 11 hours.

Math, I NEED HELP.c: - Izzy., Thursday, January 5, 2012 at 10:29pm
D:
Math, I NEED HELP.c: - Reiny, Friday, January 6, 2012 at 9:06am
equation:
cost = yt + x, where t is the number of hours
case1:
4y + x = 63 ---> x = 63-4y
case2:
6y + x = 87 ---> x = 87-6y
so 63-4y = 87-6y
2y = 24
y = 12
back into 1st equation:
x = 63-4(12) = 15

cost equation:
cost = 12t + 15
so for 11 hrs
cost = 12(11)+15
= 147

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