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# Alg:linear equations

### Review terms/formulas

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

slopes of parallel lines | same slopes (Ex. y=2x +1 and y=2x -5) |

slopes of perpendicular lines | opposite (signs), reciprocal slopes (Ex. y=3x-2 and y=-1/3x+4) |

slope intercept form | y=mx+b |

standard form | Ax+By=C |

point slope | y-y=m(x-x) |

x- and y- intercepts | use a t-chart with 0 for one x and 0 for one y; then solve substituting 0 for x to find the missing y; solve substituting 0 for y to find the missing x. |

solve for slope slope formula (rate of change) | 1) m=rise/run 2) m=y-y/x-x |

slope of horizontal line | 0 |

slope of vertical line | undefined |

Arithmetic Sequences | adding or subtracting each time in a sequence (Ex. 1,4,7,10,13,... or 100,95,90,85,80,...) |

Arithmetic Sequence Formula | A(n)=a+(n-1)d; A=first number in sequence; n=term looking for (100th?, 25th?); d=common difference (number adding or subtracting by in the given list of numbers) |

Created by:
mhacker