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# What is an equation?

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An equation is a statement declaring that two values are equal. It has an equals sign and expressions on the left and right of the equals sign; the expression on the left and the right are equal.

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In most equations, one or both sides have variables associated with them. The variable represents an unknown number. Manipulating the equation to come up with the solution to the variable is known as "solving the equation." Algebra covers a variety of types of equations and methods to solve them. For example, algebra covers linear equations of one, two or an indefinite number of variables, quadratic equations and equations of higher orders of power.

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## Related Questions

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The general equation of a circle in the Cartesian coordinate system is (x-a)2 + (y-b)2 = r2. The point (a,b) represents the center of the circle and the value of r represents the radius of the circle.

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Word equations are equations in which mathematical operations are applied to words instead of numbers. Word equations are commonly used in chemistry and are used to show common chemical reactions. Word equations are written with the name of the substance instead of the chemical abbreviation.

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An equation in math is a statement stating that two math expressions are equal. An equation always consists of an equal sign. The equal sign in an equation is read as "this equals that."