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This is a picture of my math quiz in which I got a question wrong.

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I feel I should not lose points as the question is to ambiguous. I assumed that if one point lied above x-axis then that would constitute as the graph lying above the x-axis. My teacher interpreted it as all points must lie above. Is she right?

Joffan
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David Heffernan
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    You asked this question already at http://math.stackexchange.com/questions/1195770/the-meaning-of-the-term-lies-above-the-x-axis -- if you had additional questions about the answers there, it would be better to ask them there rather than re-post the question. – Barry Cipra Mar 18 '15 at 17:59
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    There's a semantic difference between "when[ever]" and "for some" – Hagen von Eitzen Mar 18 '15 at 18:01

1 Answers1

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Note $x<-1$ refers to all of the points less than $-1$ so no, one point is not enough.

Yes your teacher is correct under the usual conventions.

JP McCarthy
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