Frequently the term linear equation refers implicitly to the case of just one variable. These equations are defined for lines in the coordinate system. In mathematics a linear equation is a type of equation.
A little bit of algebraic manipulation makes it clear that the unique solution to this linear equation is always -ba.
Usually the one we are solving for so it is located to the left of the equal sign. An equation that makes a straight line when it is graphed. A linear equation is the equation of a straight line. Frequently the term linear equation refers implicitly to the case of just one variable.