Questions on Algebra: Functions, Domain, NOT graphing answered by real tutors!

Algebra ->  Algebra -> Questions on Algebra: Functions, Domain, NOT graphing answered by real tutors!     (Log On)
Ad: Algebra Solved!™: algebra software that solves YOUR algebra homework problems with step-by-step help!


Question 151370: Which of the following are functions? Why?
a. f(x)=2 if x>1 otherwise f(x)=-1
b. f(x)=5 if x>0 or f(x)=-5 if x<0 or f(x)=5 or -5 if x= 0
c. f(x)= x/10: Which of the following are functions? Why?
a. f(x)=2 if x>1 otherwise f(x)=-1
b. f(x)=5 if x>0 or f(x)=-5 if x<0 or f(x)=5 or -5 if x= 0
c. f(x)= x/10
Answer by oscargut(666) About Me  (Show Source):
You can put this solution on YOUR website!
a) and c) are functions
but b) is not a function because is not well defined at 0