Positive numbers go to the right of zero, negative numbers go to the left of zero.
The indipendant variable
The variable x. If there is an independent variable it would be placed on the x axis but there need not be one.
A collar tie
The number its placed upon
well every integer fraction whole number natural number are rational number's surely rational numbers are represented on a number line and as rational numbers are the real numbers
Sign
on the horizontal axis!
A Horizontal Line
The number 5000 can be represented by the numeral V with a horizontal bar placed above it or by the numeral [V]
MMM = 3000 but for higher numbers of thousand a horizontal bar is placed above the required number to denote that it is x 1000 or the number can be placed in brackets which also denotes x 1000. I can't do the horizontal line with my keyboard so 11,000 is (XI) which means 11 x 1000.
The number 1000000 can be represented in Roman numerals by M with a horizontal bar placed above it or by [M]
The number 49,000 in Roman numerals can be written as either XLIX with a horizontal bar placed above it or as [XLIX]
independent
Positive numbers go to the right of zero, negative numbers go to the left of zero.
The horizontal axis is for the independent variable, which is time. Time is always placed on the horizontal, or x-axis.
The number 20,000 can be written in Roman numerals as [XX] or as XX with a horizontal bar placed above it (which I cannot write with this keyboard).