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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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A contradiction equation is never true, no matter what the value of the variable is. In this case, the answer appears as the empty set, "{ }," or "phi" from the Greek alphabet, according to Seminole State College.

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A formula equation is a visual representation of a reaction using chemical formulas. A chemical formula is an expression that states the number and types of atoms that make up any given molecule using the symbols for the elements and sub-scripted numbers.

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An inverse equation, or inverse function, is an equation that reverses another equation. If an equation will give the value of y when providing x, the inverse equation will give the value of x when providing y.