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Combined Variation
Combined variation describes a situation where a variable depends on two (or more) other variables, and varies directly with some of them and varies inversely with others (when the rest of the variables are held constant). For example, if varies directly as and inversely as , we have the following combined variation equation:
Example:
If
varies directly as
and inversely as
,
and
when
and
, for what value of
will
and
?
To find , when and