# Linear Equation

A linear equation in $n$ variables is an equation of the form $a_{1}x_{1}+a_{2}x_{2}+⋯+a_{n}x_{n}=b$ where

- $x_{1},...,x_{n}∈R$ are the variables (unknowns)
- $a_{1},…,a_{n}∈R$ are coefficients
- $b∈R$ is the constant term

To solve systems of linear equations, we use Matrix.

Next, see Homogeneous Linear Equation.