# Difference between revisions of "Linear equation"

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== Form and Connection to Analytic Geometry == | == Form and Connection to Analytic Geometry == | ||

− | In general, a linear equation with <math>n</math> variables can be written in the form <math> | + | In general, a linear equation with <math>n</math> variables can be written in the form <math>\sum_{i=1}^{n}a_ib_i=c</math>, where <math>a_i</math> is a series of constants, <math>b_i</math> is a series of variables, and <math>c</math> is a [[constant]]. |

− | For the particular case <math>n=1</math>, the resulting equation can be graphed as a point on the number line, and for the case <math>n=2</math> (resulting in a [[linear function]]), it can be graphed as a line on the [[Cartesian plane]], hence the term "linear" equation. This can extended to a general Cartesian n-space, in which the linear equation with the corresponding number of variables can be graphed as an n-1-space - this concept is the idea behind [[analytic geometry]] as envisioned by Fermat and Descartes. | + | In other words, a linear equation is an equation that can be written in the form <cmath>a_1b_1 + a_2b_2 + ... +a_nb_n = c</cmath>, where <math>a_1, a_2,... , a_n</math> are constants multiplied by variables <math>b_1, b_2, ..., b_n</math> and <math>c</math> is a constant. |

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+ | For the particular case <math>n=1</math> (single variable equation), the resulting equation can be graphed as a point on the number line, and for the case <math>n=2</math> (resulting in a [[linear function]]), it can be graphed as a line on the [[Cartesian plane]], hence the term "linear" equation. This can extended to a general Cartesian n-space, in which the linear equation with the corresponding number of variables can be graphed as an n-1-space - this concept is the idea behind [[analytic geometry]] as envisioned by Fermat and Descartes. | ||

== Systems, solutions and methods of solving == | == Systems, solutions and methods of solving == |

## Revision as of 18:30, 4 June 2015

In elementary algebra, **linear equations** are algebraic equations in which both sides of the equation are polynomials or monomials of the first degree - i.e. each term does not have any variables to a power other than one.

## Contents

## Form and Connection to Analytic Geometry

In general, a linear equation with variables can be written in the form , where is a series of constants, is a series of variables, and is a constant.

In other words, a linear equation is an equation that can be written in the form , where are constants multiplied by variables and is a constant.

For the particular case (single variable equation), the resulting equation can be graphed as a point on the number line, and for the case (resulting in a linear function), it can be graphed as a line on the Cartesian plane, hence the term "linear" equation. This can extended to a general Cartesian n-space, in which the linear equation with the corresponding number of variables can be graphed as an n-1-space - this concept is the idea behind analytic geometry as envisioned by Fermat and Descartes.