Writing an equation that models variation w varies directly with $$ u $$ and inversely, with $$ d $$ In your equation, use $$ k $$ as the constant of proportionality. $$ \square $$ $$ \square=\square $$ $$ \frac{\square}{\square} $$

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To model the variation where $$ w $$ varies directly with $$ u $$ and inversely with $$ d $$, we can express this relationship mathematically.

1. **Direct Variation**: When we say $$ w $$ varies directly with $$ u $$, it means that as $$ u $$ increases, $$ w $$ also increases. This can be expressed as:
   $$
   w = k \cdot u
   $$
   where $$ k $$ is the constant of proportionality.

2. **Inverse Variation**: When we say $$ w $$ varies inversely with $$ d $$, it means that as $$ d $$ increases, $$ w $$ decreases. This can be expressed as:
   $$
   w = \frac{k}{d}
   $$

Combining both direct and inverse variations, we can write the equation as:
$$
w = k \cdot \frac{u}{d}
$$

Thus, the final equation that models the variation is:
$$
w = k \cdot \frac{u}{d}
$$

In the format you requested:
- $$ w = k \cdot \frac{u}{d} $$
- $$ \square = k \cdot \frac{\square}{\square} $$

Where:
- The first square represents $$ w $$
- The second square represents $$ u $$
- The third square represents $$ d $$
$$ w = k \cdot \frac{u}{d} $$

Writing an equation that models variation w varies directly with \( u \) and inversely, with \( d \) In your equation, use \( k \) as the constant of proportionality. \( \square \) \( \square=\square \) \( \frac{\square}{\square} \)

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