SOLUTION: Suppose that y varies directly with x and inversely with z, and y = 18 when x = 15 and z = 5. Write the equation that models the relationship. Then find y when x = 21 and z = 7.

Question 708694: Suppose that y varies directly with x and inversely with z, and y = 18 when x = 15 and z = 5. Write the equation that models the relationship. Then find y when x = 21 and z = 7.
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
y varies directly with x means y equals multiplied times something else that does not depend on .
y varies inversely with z means y equals multiplied times something else that does not depend on .
with being a constant (just a number)
says that y varies directly with x and inversely with z,
and does not depend on anything else.
When and , so --> -->
So the equation that models the relationship is

When and
-->
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