z varies directly with x and inversely with y. When x = 6 and y = 2, z = 15. Write the function that models the variation. Then, find z when x = 4 and y = 9. Write answer in a/b form if necessary.
z = __?__
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z=kx as z varies directly with x
zy=m as z varies inversely with y
when x= 6 z= 15
when y=2 z =15
For y= 9
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