SOLUTION: The phone company Splint has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 40

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Question 1200084: The phone company Splint has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 400 minutes, the monthly cost will be $227. If the customer uses 940 minutes, the monthly cost will be $497.
Found 2 solutions by ikleyn, josgarithmetic:
Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
.
The phone company Splint has a monthly cellular plan where a customer pays a flat monthly fee
and then a certain amount of money per minute used on the phone. If a customer uses 400 minutes,
the monthly cost will be $227. If the customer uses 940 minutes, the monthly cost will be $497.
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Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
This is how Splint plan works.
For two points (time,bill) in variables (x,y) they are
(400,227) and (940,497).

y=%28%28497-227%29%2F%28940-400%29%29x%2Bb
y=0.5x%2Bb
Picking the first point,
b=y-0.5x
b=227-0.5%2A400
b=27

Cost for any month is highlight%28y=0.5x%2B27%29.