The total car wash earnings, \( y \), can be expressed as a function of the number of cars washed, \( x \), by the equation:
\[ y = 9x \]
In this equation, \( 9 \) represents the charge per car wash, and \( x \) represents the number of cars washed.
A gas station charges $9 for a drive-through car wash.
Write an equation that shows how the total car wash earnings, y, depends on the number of cars washed, x.
Do not include dollar signs in the equation.
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