Question

is the relation : [(1,1), (2,3), (4,5), (4,6)] a function ?

Answer 1

a function relation , for every x in f domain should asighn one y in the range
the relation u have as u can see for x=4 , y have two values

Answer 2

so is it a function ? :)

Answer 3

no :O
a function should be like this