Dakarai wrote the system of linear equations. 7 x plus 8 y is equal to 28 negative 3 x plus 9 y is equal to negative 24 Dakarai then wrote the coefficient matrix that represents this system. Which matrix could she have written?

A coefficient matrix contains only the coefficients of the variables, not the constants on the right side of the equations. In the first equation, the coefficients of x and y are 7 and 8; in the second, they are −3 and 9. Thus the matrix is [[7, 8], [−3, 9]], which is choice B.

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