The number line includes all rational numbers but also has irrational ones. It is the REAL number line. The square root of non-perfect squares are on it and pi is also on it and they are not rational.
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I believe that a vertical line of a graph is simply X=any real number. Real Number- a rational number or the limit o a sequence of any rational numbers, not to be confused with a complex number.
Yes.
There is a similar question which was answered as graph of real numbers. It could also be a graph of the line y=0, or a graph of the x-axis.
Real numbers can be rational or irrational because they both form the number line.
because the # line shows the rational #'s in order from least to greatest