Infinity and negative infinity are not "numbers". Depending on the context you could express it as (-1)/0, though.
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Negative infinity plus one.
negative infinity
It can't be, because one is grater then any negative number and an infinity number is grater than one.
the number line goes up to infinity on both negative and positive sides
Yes. A whole number is a number negative or positive from 1 to infinity as long as it is not a fraction or decimal number.