The number line is better understood as a two dimensional way of representing positive and negative digits in a particular interface in relation with each other. The positive integers are placed to the right hand side of zero on the number line which is also considered as the origin and the negative integers to the left hand side of zero on the number line. The origin or zero is considered as neither positive nor negative.

Number Line Figure

The set of Integers consists of all natural numbers and their opposites and also includes zero. We can represent integers on a number line. A standard number line is a horizontal line. Zero is called as the origin. The numbers to the right of zero are positive and the numbers to the left of zero are negative numbers. The numbers plotted on the number line are called as the coordinates. Usually we finish the number line on either side with arrows to show that the line can be extended in either direction.
Number Line