SOLUTION: On monday Harold picked up three donuts and six large coffees for the office staff. He paid $6.27.On tuesday Melina picked up two donuts and three large coffees for the office staf

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Question 1113189: On monday Harold picked up three donuts and six large coffees for the office staff. He paid $6.27.On tuesday Melina picked up two donuts and three large coffees for the office staff. She paid $3.40. What is the cost of one donut? What is the cost of one large coffee?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
d, dooughnut price
c, coffee price

system%283d%2B6c=6.27%2C2d%2B3c=3.4%29
You can try the Elimination Method.
Easiest to first eliminate c and find d.
Multiply the second equation by 2...

system%283d%2B6c=6.27%2C4d%2B6c=6.8%29

Subtract first of these from the second of these:
%284d%2B6c%29-%283d%2B6c%29=6.8-6.27
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