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OpenStudy (anonymous):
The school is having a bake sale and the pep squad is selling cookies. On one ticket they sold four chocolate chip cookies and six oatmeal cookies for $30. On another ticket they sold four chocolate chip cookies and three oatmeal cookies for $21. Which system of equations below can be used to determine the price of a chocolate chip cookie and the price of an oatmeal cookie? Let x represent the cost of a chocolate chip cookie, and let y represent the cost of an oatmeal cookie. 8x + 9y = 51 8x - 9y = 51 4x + 6y = 30 4x + 3y = 21 4x + 4y = 30 6x + 3y = 21
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