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# algebra ch. 4

### Matrices

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

What is true if two matrices, A and B, have the same dimensions? | Their sum A+B is the matrix in which each element is the sum of the corresponding elements in A and B. |

What is the definition of matrix multipulcation? | Suppose A is an m x n matrix and B is an n x p matrix. then the product (AB) is the m x p matrix whose element in row i and column j is the product of row i of A and column j of B. |

If two lines with slopes m1 and m2 are perpindicular, then what does m1m2 equal? | -1 |

What transformation maps (x,y) onto (x+h,y+k)? | This is a translation of h units horizontally and k units vertically. |

What is true for a line under translation? | It is parallel to its image. |

What is a reflection? | A transformation that maps a figure to its reflection image. |

What is a transformation? | A one-to-one correspondence between the points of a preimage and the points of an image. |

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jsica