SOLUTION: At Joe′s café, one cup of coffee and three doughnuts cost $4.20, and two cups of coffee and two doughnuts cost $4.80. What is the cost for one doughnut? What is the cost for

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: At Joe′s café, one cup of coffee and three doughnuts cost $4.20, and two cups of coffee and two doughnuts cost $4.80. What is the cost for one doughnut? What is the cost for       Log On


   

Question 1037308: At Joe′s café, one cup of coffee and three doughnuts cost $4.20, and two cups of coffee and two doughnuts cost $4.80. What is the cost for one doughnut? What is the cost for one cup of coffee?
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let c=coffee, d=doughnuts:
1c+3d=4.20
2c+2d=4.80; So:
2c+6d=8.40
2c+2d=4.80
4d=3.60
d=.90
c=1.50
Coffee is $1.50 a cup, and doughnuts are $.90 each!!!!!!!!!