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# Pre-Algebra Ch. 1

Term | Definition |
---|---|

algebra | a branch of mathematics dealing with symbols |

algebraic expression | an expression that contains sums and/or products of variables and numbers |

conjecture | an educated guess |

deductive reasoning | the process of using facts, properties, or rules to justify reasoning or reach valid conclusions |

coordinate plane or coordinate system | formed by the intersection of two number lines that meet at right angles at their zero points |

counterexample | an example that shows a conjecture is not true |

defining a variable | choosing a variable an a quantity for the variable to represent in an equation |

domain | the set of all x-coordinates from each pair of a relation |

equation | a mathematical sentence that contains an equal sign |

evaluate | find the numerical value of an expression |

graph | a dot at the point that corresponds to an ordered pair on a coordinate plane |

inductive reasoning | conjecture based on a pattern of examples or past events |

numerical expression | a combination of numbers and operations such as addition, subtraction, multiplication and division |

open sentence | an equation that contains a variable |

order of operations | PEMDAS |

ordered pair | a pair of numbers used to locate any point on a coordinate plane |

origin | the point at which the number lines intersect in a coordinate system |

properties | statements of equality of two or more ratios |

range | all the y-coordinates from each ordered pairs in a relation |

relation | a set of ordered pairs |

scatter plot | a graph that shows the relationship between two sets of data |

simplify | to write an expression in simpler form |

solution | a value for the variable that makes an equation true |

solving the equation | the process of finding a solution to an equation |

variable | a placeholder for any value |

x-axis | the horizontal number line which helps to form the coordinate system |

x-coordinate | the first number of an ordered pair |

y-axis | the vertical number line which helps to form the coordinate system |

y-coordinate | the second number of an ordered pair |

Created by:
Miss Brinkoetter