R= { (2,2),(2,4),(3,3),(4,4)}, Function, Not a Function, R= { (1,2),(2,3),(3,4),(4,5),(5,6),(6,7)}, Function, Not a Function, Function, Not a Function, R = { (1,3),(2,5),(1,5)}, Function, Not a Function, R= { (2,1),(3,1),(4,2)}, Function, Not a Function, Function, Not a Function, R = { (2,1),(5,1),(8,1),(11,1),(14,1),(17,1)}, Function, Not a Function, Function, Not a Function, R= { (x,y): y=2x,x,y∈N}, Function, Not a Function

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