how to know whether it is a direct variation or Inverse variation
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The SAT often asks questions about direct variation and inverse variation. These questions use wording like “…varies directly with…”, “…varies inversely with…”, “…is directly proportional to…” and “…is inversely proportional to…”
The formulas for direct and inverse variation are as follows.
Direct Variation
As one variable increases, the other variable increases proportionately.
\[ y=kx \]
Inverse Variation
As one variable increases, the other variable decreases proportionately.
\[ y=\frac{k}{x} \]
Here is a typical SAT variation problem.
The formulas for direct and inverse variation are as follows.
Direct Variation
As one variable increases, the other variable increases proportionately.
\[ y=kx \]
Inverse Variation
As one variable increases, the other variable decreases proportionately.
\[ y=\frac{k}{x} \]
Here is a typical SAT variation problem.
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it depends upon the question!
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