4) Cora plans to buy some calligraphy pens priced at $$ \$ 5 $$ each. 4)) Write an equation that shows how the total cost, $$ y $$, depends on the number of calligraphy pens Cora buys, $$ x $$. (1) Do not include dollar signs in the equation.

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To express the total cost $$ y $$ based on the number of calligraphy pens $$ x $$ that Cora buys, you can use the following equation:

$$
y = 5x
$$

**Explanation:**
- Each calligraphy pen costs \$5.
- If Cora buys $$ x $$ pens, the total cost $$ y $$ is calculated by multiplying the number of pens by the cost per pen.
- Therefore, the equation is $$ y = 5x $$.
The total cost $$ y $$ depends on the number of calligraphy pens $$ x $$ as $$ y = 5x $$.

Cora plans to buy some calligraphy pens priced at each.
4)) Write an equation that shows how the total cost, , depends on the number of
calligraphy pens Cora buys, .
(1) Do not include dollar signs in the equation.

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Cora plans to buy some calligraphy pens priced at each. 4)) Write an equation that shows how the total cost, , depends on the number of calligraphy pens Cora buys, . (1) Do not include dollar signs in the equation.