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OpenStudy (anonymous):
Which one of the following is a function? ( 3x - y2 = 9 3x - y = 9 3x2 - y2 = 9 I know the correct answer is 3x - y = 9, but why is that the correct answer?
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OpenStudy (anonymous):
i think all are functions
OpenStudy (anonymous):
there has to be just one answer though
OpenStudy (anonymous):
I guess they just want me to do the vertical line test?
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