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# 8th Math 2nd 9Weeks

### Algebra

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

Ratio | A comparison of two numbers by division. |

Rate | A comparison of two quantities with different types of units. |

Unit Rate | A rate with a denominator of 1. |

Proportion | Two equivalent ratios. |

Cross Products | Two numbers that sit diagonally to each other. |

Polygon | Closed plane figure formed by three or more line segments. |

Similar | Polygons with the same shape and a different size. |

Corresponding Parts | Parts in similar figures that match. |

Congruent | Having the same measure. |

Scale Factor | Ratio of the lengths of two corresponding sides of two similar polygons. |

Scale Drawing or Model | Represents an object that is too large or too small to be drawn or built at actual size. |

Scale | Ratio of given length to corresponding actual length. |

Indirect Measurement | Distances or lengths that are too difficult to measure directly and can be found using properties of similar polygons and proportions. |

Percent of Change | A ratio that compares the change in a quantity to the original amount. |

Markup | The increase in the price. |

Selling Price | The amount the customer pays. |

Interest | The amount of money paid or earned for the use of money. |

Principal | The amount of money invested or borrowed. |

Equivalent Expressions | Expressions that have the same value. |

Term | Each individual part of an algebraic expression separated by a plus or minus sign. |

Coefficient | The numerical value attached to a variable. |

Like Terms | Terms that contain the same variable and/or exponent. |

Unlike Terms | Terms without the same variable and/or exponent. |

Constant | A numerical term without a variable attached to it. |

Simplest Form | An expression containing no like terms. |

Relation | An equation that describes a function. |

Domain | The x values in the ordered pair. |

Range | The y values in the ordered pair. |

Function | A relation in which the x value has only one partner. |

Vertical Line Test | A test done vertically in which you pass through only one given point at a time. |

Function Rule | An equation that describes a function. |

Independent Variable | The input values. |

Dependent Variable | The output values. |

Rate of Change (Slope) | The change in a dependent variable as it relates to the change in the independent variable. |

Slope Intercept Form | Linear equation written in the form y = mx+b. |

x-intercept | The point where a line or coordinate crosses the x-axis. |

y-intercept | The point where a line or coordinate crosses the y-axis. |

Created by:
tamarablyons