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OpenStudy (anonymous):
select the sets that are NOT functions. (PLEASE HELP) A= {(1,2),(2,3),(3,4),(4,5) B= {(1,2),(2,1),(3,0),(4,-1)} C= {(-1,3),(0,3),(1,3),(2,3)} D= {(1,1),(1,2),(1,3),(1,4)} E= {(6,2),(7,3),(6,-1),(5,4)
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OpenStudy (anonymous):
A set is a function if and only if there is only one point per x value, so that an x value doesn't appear twice. Which of these sets has the same x value in two or more points?
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