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Suppose that y is inversely proportional to x.

Find the constant of proportionality k if y = 18 when x = 4.
k =
Using the k from above write the variation equation in terms of x.
y =
Using the k from above find y given that x = 9.
y =

If needed, round answer to 3 decimal places.
Enter DNE for Does Not Exist, oo for Infinity