8.1.1 Variation Functions (continued) Example 2 Solving Direct Variation Problems To find specific values in a direct variation problem, solve for k and then use substitution or a proportion.
Example 3 Solving Joint Variation Problems If y varies jointly as x and z , then the relationship between x , y , and z , called a joint variation, can be described by an equation of the form y = kxz , where k is the constant of variation.
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