Theory:

The number line is that we commonly use the horizontal line of the coordinate axis. In a Number line, usually zero is in the middle, and the positive numbers are to the right side of the zero and the negative numbers to the left.
  • A straight coordinate line is also called Number line.
  • A numerical representation of a point's location is called a point coordinate.
If a coordinate origin is marked, on a line, then the line turns into a number line (therefore, the point corresponding to \(0\)). The positive axis represents to the right or up and is mark by an arrow in the drawing.
 
ass_neg3.png
    
The figure shows that the coordinates start at C.
The coordinate of point A is \(-3\).
The coordinate of point B is \(-1\).
The coordinate of the point D is approximately \(2.5\).
The coordinate of point E is \(4\).
 
Brief record is as follows: A (\(-3\)); B (\(-1\)); C (\(O\)); D (\(2.5\)); E (\(4\)).
 
Of the given points, positive values ​​are for points \(D\) and \(E\), while negative values ​​are for \(A\) and \(B\).