1. | A(2,1), B(–1,–3), C(–3,0), D(0,3), E(3,–3) |

2. | The answer is shown in Figure 1.21.
## Figure 1.21. Graph of points A through E. |

3. | (–2,1,–4) |

4. | (2,3,2) |

1. | Yes |

2. | Yes |

3. | Yes |

4. | No |

5. | The answer is shown in Figure 1.22.
## Figure 1.22. Graph of x – 2y = 0. |

6. | The answer is shown in Figure 1.23.
## Figure 1.23. Graph of –3x + y = 4. |

7. | The answer is shown in Figure 1.24.
## Figure 1.24. Graph of x = 1. |

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