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26 March, 16:37

4x-7y=3

x+7y=15

solve using elimination

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Answers (1)
  1. 26 March, 17:46
    0
    4x-7y=3

    x+7y=15

    we sum these equations

    4x+x-7y+7y=3+15

    5x=18

    x=18/5

    x+7y=15

    18/5+7y=15 |*5

    18 + 35y=75

    35y=75-18

    35y=57

    y=57/35
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