### Example 1

Create a coefficient matrix from these equations: 3 |

### Example 2

What are the rows and columns in the matrix: |

### Example 3

Find D, the determinant of the coefficient matrix from Example One above: |

### Example 4

Find D from this matrix: |

Create a coefficient matrix from these equations: 3 |

What are the rows and columns in the matrix: |

Find D, the determinant of the coefficient matrix from Example One above: |

Find D from this matrix: |