Question 1158431: which of the following relations are functions?
a. {children}-{stuffed aninals}
b. f(x)=sqrt(x^2+3)
c.h(x)=1/x^2
d.x=3
e.x^2+y^2=5
f.{(2,3),(3,4),(4,4),(5,6)}
Answer by KMST(5385)   (Show Source):
You can put this solution on YOUR website! The following are functions of x, because to every x in the domain there i just one value assigned in to the other variable:
b. f(x)=sqrt(x^2+3)
c.h(x)=1/x^2
d.x=3
f.{(2,3),(3,4),(4,4),(5,6)}
The relation a. between children and stuffed animals is probably understood as not a function, because if I ask what stuffed animal belongs to Susie, , there may be more than one.
The relation e.x^2+y^2=5 graphs as a circle of radius  , centered at the origin, but it is not a function, because for every value of x, except  and  there are two values of y.
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