**Instructions:**

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

9 . x + 9 . y | = | -54 |

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

= | ||

= | ||

= | ||

x | = | |

y | = | |

Correctness test | ||

9 . + 9 . | = | -54 |

18 . - 9 . | = | 27 |

9 . x + 9 . y | = | -54 |

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

x | = | -1 |

y | = | -5 |

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Equations of 2 unknowns