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jordanguruu

  • 3 years ago

If x varies inversely as y and x = 48 when y = 4, find y when x = 3. A. y = 16 B. y = 12 C. y = −4 D. y = 64

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  1. aroub
    • 3 years ago
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    Because it varies inversely so it's, xy=k, we just substitute the values that are given in the equation to find k: xy=k 48(4)=k 192=k xy=k 3(y)=192 y=64

  2. aroub
    • 3 years ago
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    And you can also use this way: x1*y1=x2*y2 (i think it's easier)

  3. jordanguruu
    • 3 years ago
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    how about this one?

  4. jordanguruu
    • 3 years ago
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    If x varies inversely as y and x = 10 when y = 20, find y when x = 25. A. y = 8 B. y = 5 C. y = −10 D. y = 4

  5. aroub
    • 3 years ago
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    What about you try? :)

  6. jordanguruu
    • 3 years ago
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    i've already did and couldnt get it and i've asked someone on here and they couldnt figure it out

  7. aroub
    • 3 years ago
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    O.o Okay I'll do it but using the second way. x1*y1=x2*y2 10(20)=25(y) 200=25y y=8

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