SOLUTION: please help me figure out this problem: Ruben bought 2 cheeseburgers and 3 bags of fries for $16.50, not including tax. Chris bought 1 cheeseburger and 2 bags of fries for $9.50

Question 307336: please help me figure out this problem:
Ruben bought 2 cheeseburgers and 3 bags of fries for $16.50, not including tax. Chris bought 1 cheeseburger and 2 bags of fries for $9.50, not including tax. What was the cost of a bag of fries?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
2C+3F=16.50
1C+2F=9.50 MULTIPLY BY -2 &ADD.
-2C-4F=-19.00
2C+3F=16.50
---------------
-F=-3.00
F=$3.00 COST OF 1 BAG OF FRIES.
C+2*3=9.50
C+6=9.50
C=9.50-C
C=3.50 COST OF 1 CHEESEBURGER.
PROOF:
2*3.50+3*3=16.50
7.00+3*3=16.50
7.50+9=16.50
16.50=16.50
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