SOLUTION: Collin bought 3 cookies and 5 doughnuts for $12.50. Dana bought 1 cookie and 1 doughnut for $3.00. How much is a cookie? a doughnut?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Collin bought 3 cookies and 5 doughnuts for $12.50. Dana bought 1 cookie and 1 doughnut for $3.00. How much is a cookie? a doughnut?       Log On


   

Question 1109120: Collin bought 3 cookies and 5 doughnuts for $12.50. Dana bought 1 cookie and 1 doughnut for $3.00. How much is a cookie? a doughnut?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
system%283c%2B5d=12.5%2Cc%2Bd=3%29

Use Elimination Method, to start.
3c%2B5d-3c-3d=12.5-9
2d=3.5
d=3.5%2F2
d=1.75
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