SOLUTION: Which one of these are functions? 1) x = 4 2) y = 2x + 5 3) y=x

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Question 157669: Which one of these are functions?

1) x = 4
2) y = 2x + 5
3) y=x
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
1) is not a function because the graph is avertical line
2) and 3) are functions because they are not vertical lines