A finite set of equation with the variables x1, x2- - - - -xn is called a System of Linear Equation.
a1x1 + a2x2 + - - - - - - + anxn = b ----------------------- (1)
Where a1, a2 - - - - - - an and b are real constants. An equation of this form is called Linear Equation in the variables x1, x2 - - - - - - xn . The variables in a linear equation are sometimes called Unknown.
And there are two types of linear equation such as Homogeneous Linear Equation and Non-homogeneous Linear Equation.