**Instructions:**

Solve a set of two equations with two unknowns and find out values of unknown variables x and y.

1 . x - 2 . y | = | 1 |

-1 . x - 1 . y | = | 2 |

= | ||

= | ||

= | ||

x | = | |

y | = | |

Correctness test | ||

1 . - 2 . | = | 1 |

-1 . - 1 . | = | 2 |

1 . x - 2 . y | = | 1 |

-1 . x - 1 . y | = | 2 |

x | = | -1 |

y | = | -1 |

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Equations of 2 unknowns