Question 150805
On Monday, Jordan paid $5.45 for three cartons of milk, four cups of coffee, and seven doughnuts. On Tuesday, Ryan paid $5.30 for four milks, two coffees, and eight doughnuts. On Wednesday, Zack paid $5.15 for two milks, five coffees, and six doughnuts. 


(1)   Set up a system of equations to model this scenario.
m=price milk  d=price doughnuts   c=price coffee


3m+4c+7d=5.45
4m+2c+8d=5.30
2m+5c+6d=5.15


This is the system you want to solve.  Or you can solve:


3m+4c+7d=545
4m+2c+8d=530
2m+5c+6d=515


The only difference is that you would get your answers in terms of cents, not dollars.