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ihavemathquestions

Find the value of y for a given value of x, if y varies directly with x. If y = –252 when x = 84, what is y when x = 74?

  • one year ago
  • one year ago

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  1. swiftskier96
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    Do you know how to cross multiply?

    • one year ago
  2. ihavemathquestions
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    yea

    • one year ago
  3. swiftskier96
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    Ok. Well here is the problem you are talking about. |dw:1349372516244:dw|

    • one year ago
  4. swiftskier96
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    Now just solve for y. Whats the answer?

    • one year ago
  5. ihavemathquestions
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    -1764 = 84y

    • one year ago
  6. swiftskier96
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    What i did is when i cross multiplied, i got -252(74) = 84(y). Then it looked like this...|dw:1349372692894:dw|

    • one year ago
  7. swiftskier96
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    Now just multiply -252 and 74 and divide it by 84. And that equals?

    • one year ago
  8. ihavemathquestions
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    -222

    • one year ago
  9. swiftskier96
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    Correct!

    • one year ago
  10. ihavemathquestions
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    xo

    • one year ago
  11. ihavemathquestions
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    For each function, what is the output of the given input? For f(x) = 4x + 7, find f(4)

    • one year ago
  12. swiftskier96
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    Is this a quick check or quiz? Cause i remember doing something like this.

    • one year ago
  13. ihavemathquestions
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    this is just my brother and i we make eachother do math its like fun

    • one year ago
  14. ihavemathquestions
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    we find random q's online

    • one year ago
  15. ihavemathquestions
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    these are the qs im giving to him that idk the answer and i needa know the answers so i can check his

    • one year ago
  16. swiftskier96
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    Ohh ok. Well that should be easy to do. Just plug 4 into x. It should look like this. f(4) = 4(4) + 7.

    • one year ago
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