SOLUTION: A caterer's total cost for catering a party includes a fixed cost, which is the same for every party. In addition the caterer charges a certain amount for each guest. If it cost $3

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Question 260956: A caterer's total cost for catering a party includes a fixed cost, which is the same for every party. In addition the caterer charges a certain amount for each guest. If it cost $300 to serve 25 guest and $420 to serve 40 guests, find the fixed cost and the cost per guest
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Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
F+25X=300
F+40X=420 SUBTRACT.
-----------------
-15X=-120
X=-120/-15
X=$8 PER GUEST.
F+25*8=300
F+200=300
F=300-200
F=$100 IS THE FIXED COST.
PROOF:
100+40*8=420
100+320=420
420=420