KJ4UTS
  • KJ4UTS
1. A company has determined that the number of items it sells varies inversely as the price of the item. If 20,000 items can be sold if the price is $9.50, how many items can be sold of the price is $8.75? Round your answer to the nearest whole number. 2. The time, T, for a car to travel from Macon to Atlanta is inversely proportional to the speed, R. If it takes 1.75 hours to travel between the two cities at 55 mph, find (in hours) the time to travel between the two cities at 70 mph. It would take ____ hours to travel from Macon to Atlanta. Round your answer to two decimal places.
Mathematics
katieb
  • katieb
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KJ4UTS
  • KJ4UTS
KJ4UTS
  • KJ4UTS
@welshfella is this similar to the previous problem, how would I set these up?
welshfella
  • welshfella
inverse variation is like y = k/x y = 20,000 and x = 9.50 plug these 2 values into the equation and calculate k Then plug in the value of k you just found and put x = 8.75. Then you can work out the new number of items to be sold.

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KJ4UTS
  • KJ4UTS
20,000/9.50 = 2105.263
KJ4UTS
  • KJ4UTS
Oh I made a mistake hold on
welshfella
  • welshfella
No 20,000 = k / 9.50 now solve for k
welshfella
  • welshfella
- you need to multiply both sides of the equation by 9.5
KJ4UTS
  • KJ4UTS
190,000
welshfella
  • welshfella
|dw:1444157521890:dw|
welshfella
  • welshfella
right
welshfella
  • welshfella
now you have y = 190,000/8.75
welshfella
  • welshfella
- i have replace k by 190,000
KJ4UTS
  • KJ4UTS
190,000/8.75=21,714.285
welshfella
  • welshfella
right - of course you need to round that down to 21,714
welshfella
  • welshfella
gtg right now
KJ4UTS
  • KJ4UTS
Ok thanks :)

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