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gdogthegirl Group Title

Help please!? The sales tax on a new car varies directly to(or is directly proportional) the price of the car. If $1,800 in sales tax is paid for a $25,000 car. what is the purchase price of a car worth $1,600 in sales tax? Im totally lost when it comes to variations :(

  • 2 years ago
  • 2 years ago

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  1. gdogthegirl Group Title
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    could you show the steps too?

    • 2 years ago
  2. tcarroll010 Group Title
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    It's a question in proportions. 1800 is to 25000 as 1600 is to x. Are you with me so far?

    • 2 years ago
  3. gdogthegirl Group Title
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    yes

    • 2 years ago
  4. gdogthegirl Group Title
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    but im not supposed to use proportions

    • 2 years ago
  5. gdogthegirl Group Title
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    its for variations like this is a direct variation

    • 2 years ago
  6. tcarroll010 Group Title
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    "varies directly" is the same as proportions. You will use an equation like a/b = c/x.

    • 2 years ago
  7. tcarroll010 Group Title
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    1800 = a. 25000 = b. 1600 = c. Just get x

    • 2 years ago
  8. li_za12 Group Title
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    25000/1800 = x/1600 25000/1800 = 13.89 1800 x 13.89 = 25 1600 x 13.89 = x

    • 2 years ago
  9. gdogthegirl Group Title
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    the equation they gave to use to use was y=kx ^{n} \]

    • 2 years ago
  10. gdogthegirl Group Title
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    y=kx squared to n

    • 2 years ago
  11. tcarroll010 Group Title
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    What is your value for k?

    • 2 years ago
  12. gdogthegirl Group Title
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    that what i dont know

    • 2 years ago
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