Math help?


In a cafeteria, 3 coffees and 4 donuts cost $10.05. In the same cafeteria, 5 coffees and 7 donuts cost $17.15. Also whats make you say your answer?

The variables are
c = cost of a coffee
d = cost of a donut
——————
Translating into equations:

3 coffees and 4 donuts cost $10.05
3c + 4d = 10.05

5 coffees and 7 donuts cost $17.15
5c + 7d = 17.15

http://goo.gl/y49sTR

What is the question?

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