Samantha works at a bookstore and is paid a fixed amount of $⁢50 per week plus $⁢10 for every book she sells. If y represents her total earnings for a week and x represents the number of books she sells, which equation best represents this situation?

Samantha earns $50 each week regardless of how many books she sells, so $50 is the fixed amount. She also earns $10 for each of the x books, giving 10x; adding the two parts gives y = 10x + 50, choice D.

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