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Use linear combinations to solve these systems. 5r-3s=12 3r+55=28

  • algebra -

    3r+55=28
    3r = -27
    r = -9

    5r-3s=12
    (5 * -9) - 3s = 12
    -45 -3s = 12
    -3x = 57
    x = -19

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