**Instructions:**

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

9 . x - 18 . y | = | -27 |

9 . x + 9 . y | = | 27 |

= | ||

= | ||

= | ||

x | = | |

y | = | |

Correctness test | ||

9 . - 18 . | = | -27 |

9 . + 9 . | = | 27 |

9 . x - 18 . y | = | -27 |

9 . x + 9 . y | = | 27 |

x | = | 1 |

y | = | 2 |

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Equations of 2 unknowns