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# Equations

### Definition

Question | Answer |
---|---|

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 |