SOLUTION: Hellllllpppppppp On Monday, Archie paid $2.54 for three doughnuts and two coffees. On Tuesday he paid $2.46 for two doughnuts and three coffees. On Wednesday he was tired of pay

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Question 25766: Hellllllpppppppp
On Monday, Archie paid $2.54 for three doughnuts and two coffees. On Tuesday he paid $2.46 for two doughnuts and three coffees. On Wednesday he was tired of paying the tab and went out for coffeeby himself. What was his bil for one doughnut and one coffee
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
Let the amount of coffe be x
Let the amount of donuts be y
Now 3 donuts and 2 coffe cost 2.54
Expression: 3y+2x=2.54
Solve for x
2x=2.54-3y
x=1.27-1.5y (subsitution)

Now 2 donuts (y) and 3 coffee (x) cost 2.46
2y+3x=2.46
Subsitute
2y+3(1.27-1.5y)=2.46
2y-4.5y+3.81=2.46
-2.5y=-1.35
y=0.54

x=1.25-1.5(0.54)
x=0.44

Hence, a coffee cost about $0.54, and a donut costs $0.44
Paul.