Question
If $x$ and $y$ are two quantities, then $y$ is directly proportional to $x$ if there is a nonzero number $k$ such that ________.
Step 1
In this case, $y$ is directly proportional to $x$. This means that as $x$ increases, $y$ also increases. Similarly, as $x$ decreases, $y$ also decreases. The rate at which $y$ changes with respect to $x$ is constant. Show more…
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