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# Equations

### Definition

Identities An identity is an algebraic equality which is true whatever the value of letter involved is
Equation Is an equality in which there is at least one letter that is called the unknown
The solution of the equation Is the value or values of the unknown (or of the unknowns) that make the equation equal.
To solve an equation Is to work out the solution, or solutions, or to arrive at conclusion that there isnĀ“t a solution
Two equations are equivalent if they have the same solutions or neither have a solution
First degree (linear) equations In there x only appears to the power of 1.
Second degree equations Involve at least one variable that is squared, or raised to a power of two.
Member Each side of the equal sign is called a member
Operations Addition, Subtraction, multiplication or division
Equal sign ' = ' The equations always have equal signs
Variable The variables refer to the unknown, you can use any letter
Coefficient It is the number that is attached to the variable
Constant They are the numbers that go alone without variable
Created by: Castroa

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