To analyze the equation \( 8x - 3y = 2x + 9y \), we first identify the various components:
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Variables: In this equation, the variables are \(x\) and \(y\). There are two variables, not four.
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Coefficients: In the equation, the coefficients are the numbers multiplying the variables:
- For \(8x\), the coefficient is \(8\).
- For \(-3y\), the coefficient is \(-3\).
- For \(2x\), the coefficient is \(2\).
- For \(9y\), the coefficient is \(9\).
Therefore, the numbers \(8, -3, 2,\) and \(9\) are all coefficients.
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Constants: A constant is a number that does not change and does not multiply a variable. In this case, there are no constants explicitly in the equation since all numbers are associated with variables.
Given these analyses, the correct statement is:
8, −3, 2, and 9 are coefficients.