How can I tell if this is a function or not?

Question

anonymous · Answer

attachment

amistre64 · Answer

for any value of x, how many possible values of y are there?

amistre64 · Answer

and quite frankly, the best you can do with the graph is assume ...

anonymous · Answer

I'm not sure, this graph confuses me.

anonymous · Answer

Four possible values?

amistre64 · Answer

you are thinking of when y=0,  thats not what we ned to lok at

anonymous · Answer

Or is it 2?

amistre64 · Answer

there is something inanely called a vertical line test.  it means that for any perfectly vertical line drawn on a perfectly drawn graph will only hit in at most 1 place along the curve

amistre64 · Answer

now, assuming these perfections exist, is there anyplace on this graph that you could draw a vertical line and hit the curve in MORE than 1 place?

anonymous · Answer

No

amistre64 · Answer

then we can assume its a function.

anonymous · Answer

So if a vertical line doesn't meet more then one curve then that wouldn't be a function?

anonymous · Answer

Sorry, didn't mean to type doesn't

anonymous · Answer

I mean wouldn't

amistre64 · Answer

if it crosses the curve at MORE than 1 point, its not a function.

it can cross at 0 points, or 1 points, but never more

anonymous · Answer

Ok, thank you for the help.

amistre64 · Answer

good luck :)

anonymous · Answer

Thank you.

aum · Answer

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