## Linear inequalities

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.