Which graph shows a set of ordered pairs that represent a function?
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If a vertical line is drawn then the line will cut at only one point. In first graph for all x values we have different y values so the ordered pairs represent a function.
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A relation is just a set of ordered pairs (x,y) . In formal mathematical language, a function is a relation for which: if (x1,y) and (x2,y) are both in the relation, then x1=x2 . This just says that in a function, you can't have two ordered pairs with the same x -value but different y -values
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