Inequalities on a number line
We can use a number line to represent or show inequalities. We use a circle to show the lowest/highest value and then an arrow to show the other numbers that could satisfy that inequality.
For example, to show the inequality x > 2, we would draw a circle at 2, then an arrow going to the right, as x could be any number greater than 2.
To show "greater than", we use an open circle because the value of x is not included. To show "greater than or equal to", we use a filled-in circle because the value of x is included.
If x is between two values, we represent each of these values with the appropriate circle, then join the two circles with a line.