anonymous
  • anonymous
If y varies directly as x, and y is 6 when x is 72, what is the value of y when x is 8?'
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Vocaloid
  • Vocaloid
direct variation takes the form y = kx if y = 6 and x = 72, what is k?
anonymous
  • anonymous
1/9!

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Vocaloid
  • Vocaloid
not quite 6 = 72k what is k?
Vocaloid
  • Vocaloid
need to get some sleep, @dan815 would you mind taking over? I think they've got a few more questions after this one
anonymous
  • anonymous
To find k, we need to get k by its self and we do that by dividing by 72 on each side of the equal sign. 6 = 72k 6 / 72 = 72k /72 6 / 72 = k 1 /12 = k k = 1 /12 Now that we found k (our constant of variation ) we can solve for "what is the value of y when x is 8" y = xk y = 8 * (1 / 12) y = 2/3

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