Which set of ordered pairs models a function?
{(2,9), (7,5), (3, 14), (2, 6)}
{(5, 10). (5, 15). (5, 20), (5, 25)]
{G-5).(-5) 6 -6 -6)}
(-10, 20). (-20, 30). (-30, 20). (-40, 10)