SOLUTION: Could someone explain to me how you know aif a graph is a function. here are three points to work with. (-4,9) (2,2) (8,8)

Algebra ->  Graphs -> SOLUTION: Could someone explain to me how you know aif a graph is a function. here are three points to work with. (-4,9) (2,2) (8,8)      Log On


   

Question 132888: Could someone explain to me how you know aif a graph is a function.
here are three points to work with.
(-4,9) (2,2) (8,8)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Since for each x there is one output, this means that this graph is a function. If we had the set of points

(-4,9) (2,2) (8,8) (2,5)


then it would not be a function since when x=2, then y=2 and 5 which is not possible for a function.