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Assessment items Item 13 The variables x and y vary directly. Use the values to find the constant of proportionality, k. Then write an equation that relates x and y . y=72; x=3 k= y=

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sqdancefan
A proportion can be written as
  y = kx
Substituting the given information, we can find k.
  72 = k*3
  72/3 = k = 24

You have ...
  k = 24
  y = 24x
to find the constant of proportionality you gotta divide the x by the y to get your answer 

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