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Sarah_Miller720

For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. x- 3 6 8 y- 6 18 24 I dont get how to solve this

  • one year ago
  • one year ago

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  1. JayDS
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    wow, that's weird..

    • one year ago
  2. Sarah_Miller720
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    these are my choices yes; y = 2x yes; y = 3x yes; y = 4x no; y does not vary directly with x

    • one year ago
  3. JayDS
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    oh k, I know the answer then. Which one do u think it is?

    • one year ago
  4. JayDS
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    think of the same concept we applied to previous similar questions.

    • one year ago
  5. Sarah_Miller720
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    yes; y= 3x?

    • one year ago
  6. JayDS
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    nope.

    • one year ago
  7. JayDS
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    use the point (3,6) substitute that into y=3x 6=3(3) 6=9 not correct.

    • one year ago
  8. Sarah_Miller720
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    yes; y = 2x

    • one year ago
  9. JayDS
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    nope.

    • one year ago
  10. JayDS
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    u have to try them for all points!!!

    • one year ago
  11. Sarah_Miller720
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    im confused lol

    • one year ago
  12. Sarah_Miller720
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    This is what i did with how you explained it above ^^ 6=3(3) this equals 9 18= 6(6) this equals 36 24= 8(8) this equals 64

    • one year ago
  13. JayDS
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    I'll give u another minute before explaining it.

    • one year ago
  14. JayDS
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    wait, u are confusing me.

    • one year ago
  15. JayDS
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    lol.

    • one year ago
  16. Sarah_Miller720
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    im confused too

    • one year ago
  17. JayDS
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    ok, let me explain from the very start. (3,6) , (6,18) , (8,24) These are all the points/values given. we are also given y=2x, y=3x, y=4x or it doesn't vary. **Important: The rule must work for all points. lets test all three points for y=2x (3,6) (6,18) (8,24) y=2x y=2x y=2x 6=2(3) 18=2(6) 24=2(8) 6=6 18=12 24=16 y=2x is not the answer because only (3,6) works. lets try y=3x (3,6) (6,18) (8,24) y=3x y=3x y=3x 6=3(3) 18=3(6) 24=3(8) 6=9 18=18 24=24 y=3x is not the answer because only (6,18) and (8,24) work. same thing, u can try for y=4x it will not work. Therefore our answer is......?

    • one year ago
  18. Sarah_Miller720
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    no; y does not vary directly with x

    • one year ago
  19. JayDS
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    yes u are right.

    • one year ago
  20. Sarah_Miller720
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    thanks so much

    • one year ago
  21. JayDS
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    no problem.

    • one year ago
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