If in an expression, two expressions or values are written equal, then it is called an equation. For instance, $$3x+4y=12$$. On contrary to this, if an expression shows the relation between the two values with the sign ‘$$<$$’(less than), ‘$$>$$’ (greater than), ‘$$\leq$$’(less than or equal to), ‘$$\geq$$’(greater than or equal to), then it is termed as an inequality.

Graphical representation plays an important role in mathematics as it makes the overall material easy to understand for everyone.  Either they are linear or quadratic, equation or inequalities, they can be shown graphically.