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Help me thank u with these questions I appreciate it

Help me thank u with these questions I appreciate it-example-1
User Anouck
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18. not a function

19. not a function

20. the left side graph is a function

18. Any relation to be a function, any x value should have only one y value

this is not a function because when x=7 , y= 9 and 12 (two y values for one x value)

19. x=-1 has two y values

and x=1 also has two y values

20. here, you can use the vertical line test.

the left graph passes the vertical line test which is a function because any vertical line drawn intersects the curve in only 1 point, but the right graph, the vertical line intersects the curve in 2 points, which is not a function.

User Migdalia
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