A T-shirt shop charges $15 for an adult shirt and $12 for a youth shirt. The total charge for a shirt order was $489. Which equation can be used to represent x, the number of adult shirts sold and y, the number of youth shirts sold?

Each adult shirt costs $15, so x adult shirts bring in 15x dollars. Each youth shirt costs $12, so y youth shirts bring in 12y dollars. Their combined charge is $489, giving 15x + 12y = 489, which is choice C.

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