College algebra

Question

On? Monday, Harold picked up four donuts and three large coffees for the office staff. He paid $4.83.On? Tuesday, Melinda picked up six donuts and two large coffees for the office staff. She paid $5.12.What is the cost of one? donut? What is the cost of one large? coffee?

Answer 1

4d + 3c = $4.83

 

6d + 2c = $5.12 

 

Sole using elimination: 

 

3(4d + 3c = $4.83) 

 

-2(6d + 2c = $5.12) 

 

12d + 9c = $15.49

-12d - 4c = -$10.24 

 

5c = $5.25

 

c = $1.05 

 

d = $0.42