SOLUTION: An electronics company sells 5.4 million MP3 players per month at a price of $90 apiece; when the price is lowered to $70, the company sells 6.2 million players per month. How man

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: An electronics company sells 5.4 million MP3 players per month at a price of $90 apiece; when the price is lowered to $70, the company sells 6.2 million players per month. How man      Log On


   

Question 534431: An electronics company sells 5.4 million MP3 players per month at a price of $90 apiece; when the price is lowered to $70, the company sells 6.2 million players per month. How many MP3 players can the company expect to sell per month at a price of $75?
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
(90,5.4)
(70,6.2)
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m = (5.4-6.2)/(90-70)
m = -.8 / 20
m = -.04
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y = -.04*x + b
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Use point (70,6.2) to find 'b'
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6.2 = -.04(70) + b
6.2 = -2.8 + b
b = 9
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y = -.04*x + 9
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x = 75
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y = -.04*75 + 9
y = 6
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Answer: At a price of $75, the company expects to sell 6 million MP3 players.
.
Done.