< indicates that the expression on the left is less than the expression on the right, for example:
indicates that 3 is less than 9 and we all know that to be true.
means that the solution to the expression on the left is less than zero, but more on that later.
> indicates that the expression on the left is greater than the expression on the right, for example:
shows that 9 is greater than 3 and similarly
means that the value of 2x - 9 is greater than 11
≤ indicates that the value on the left is less than or equal to the value on the right, for example:
means that the value of the expression on the left must be less than or equal to 25
≥ indicates that the value on the left is greater than or equal to the value on the right, for example:
Inequalities are best thought of as representing different regions on a number line:
< represents the region to the left of a given number, for example