anonymous
  • anonymous
If y varies directly as​ x, and y=12 when x=4​, find y when x=9.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Direct variation, do you know the formula?
anonymous
  • anonymous
y=kx
anonymous
  • anonymous
I am getting the wrong answer and only have one try left for this online course. could you help?

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anonymous
  • anonymous
Substitute the given values.
Jhannybean
  • Jhannybean
Start by solving for k k = y/x = 12/4 = ?
anonymous
  • anonymous
i got 3=k and 3=x. says x is wrong
Jhannybean
  • Jhannybean
One step at a time. k = 3. substitute this back in to your formula. y =3x Now when x = 9 what would y =? y = 3 * 9 = ?
anonymous
  • anonymous
oh okay. i divided
Jhannybean
  • Jhannybean
mmhmm.
anonymous
  • anonymous
thx

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