Linear equations
Definition: Linear equation with one variable 
— an equation of the form 
where 
is a real number.
If 
, then the linear equation is also called equation of the first degree.
Example of solving linear equations
then 
When 
is the only root
If 
(
— infinite number of roots)
Linear inequalities
Definition: a Linear inequality in one variable is an inequality of the form 
where 
is a real number.
If , nerst is also called a linear inequality of the first degree.
Example of solving linear inequality
then 
When 
When 
(if 
— any number 
— rozvytku no. any number.)
When 
