thumb|250px|right|In three-dimensional Euclidean space, these three planes represent solutions to linear equations, and their intersection represents the set of common solutions: in this case, a unique point. The blue line is the common solution to two of these equations.
thumb|250px|right|In three-dimensional Euclidean space these three planes represent solutions to linear equations, and thei:r intersection represents the set of common solutions in this case, a unique point The b,l.ue line is the common solution to two of these equations.