Question 812643: At McDonald's four cheeseburgers and three medium fries have a total of 2290 calories. Six cheeseburgers and two medium fries have 2560 calories. How many calories does each item contain?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! 4c + 3f = 2290
6c + 2f = 2560
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4c + 3f = 2290
(-3/2)6c + (-3/2)2f = (-3/2)2560
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4c + 3f = 2290
-9c - 3f = -3840
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add:
-5c = -1550
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c = 310
f = 350
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