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25 June, 09:44

3x + 7y = 47

-4x + 7y = 19

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Answers (1)
  1. 25 June, 10:28
    0
    3x+7y=47

    -1 (-4x+7y=19)

    Distribute the - 1 and add the equations together ... you'll get:

    7x=28

    x=4

    Plug X=4 back in ...

    12+7y=47

    7y=35

    y=5
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