Which value, when placed in the box, would result in a system of equations with infinitely many solutions? y is equal to negative 2 x plus 4 6 x plus 3 y is equal to square

For infinitely many solutions, the second equation must be true for every point on the line y = -2x + 4. Substitute that expression for y in 6x + 3y: 6x + 3(-2x + 4) = 12. Thus the box must contain 12, choice C.

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