18 What does the function f(3) = 15 mean? %3D When the a-coordinate is 3 for this function, the y-coordinate is 15. B When the -coordinate is 3 for this function, the y-coordinate is 12. When the a-coordinate is 15 for this function, the y-coordinate is 12. D When the x-coordinate is 15 for this function, the y-coordinate is 3.

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