Question 119978
Ordered pairs are represented as (x,y) . A set of ordered pairs will be a function if and only if there are no repetitions of x. 

a.(3,4),(4,5),(5,6),(3,7)

'tis not a function, the x's are 3,4,5,and 3 again? getz?


pursuing,

b.(3,6),(3,9),(3,12),(3,15)---not a function, 3 repeated all throughout
c.(3,4),(3,5),(3,6),(3,7)---not a function, 3 repeated all throughout
d.(3,4),(5,6),(7,8),(9,10)---a certified function!


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