надо решить линейное уравнение графическим
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{4 y - x = 13 |

116 y - 2 x = 13 |

{-(2 x) + 116 y = 13 |

-x + 4 y = 13 |

{-(2 x) + 116 y = 13 |

0 x - 54 y = 13/2 |

{-(2 x) + 116 y = 13 |

0 x - 108 y = 13 |

{-(2 x) + 116 y = 13 |

0 x+y = -13/108 |

{-(2 x)+0 y = 728/27 |

0 x+y = -13/108 |

{x+0 y = -364/27 |

0 x+y = -13/108 |

x = -364/27

y = -13/108