Question 820909: You are choosing between two long-distances telephone plans. Plan A has a monthly fee of $25.00 with a charge of $0.10 per minute for all long-distance calls. Plan B has a monthly fee of $6 with a charge of $0.15 per minute for all long-distance calls. Find the cost function (in terms x) for each. For how many minutes of long-distance calls will the costs for the two planes be the same?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! ---
plans A and B:
y = 0.10x + 25
y = 0.15x + 6
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put the system of linear equations into standard form
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0.10x - y = -25
0.15x - y = -6
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x= 380
y= 63
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answer:
for 380 minutes per month, both plans cost $63 per month
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