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Help for Exercises 31-33 on page 643
One way to tell what type of variation equation applies is to decide what happens to one variable if the other variable is increased. For example, if one variable increases when the other is increased, then the equation is a direct variation equation. On the other hand, if one variable increases when the other is decreased then the equation is an indirect variation equation. Be careful, this approach only applies to situations where k > 0, as is the case with Exercises 31-33.
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