Equation: What is an equation?, definition and examples

Equations

What is an equation?

An equation is the equality between two mathematical expressions in which at least one variable or unknown is involved. This equality may or may not be verified and, if there is, occurs for a value of the variable or a given set of values assigned to its variables.

Every equation will have the symbol «=» which means equality and which is used to represent the equality of two mathematical or algebraic expressions. The expressions on both sides of the equal sign are called the «left side» and the «right side» of the equation.

Examples of Equations:

Note below 5 examples of equations:

1. x = 2
2. 2x + 4 = 10
3. 4x²– y = 3x – 5
4. 3x⁵+ 2xy³= 10
5. 7x⁵+ xy³ + z = x³ + 5x²y² + 8

Note that equations 1 and 2 have the variable «x» and the equations in examples 3, 4 and 5 to «x» and «y».