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algebra

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solve by elimination
2r - 9s = -17
9r + 2s = 51

  • algebra -

    18 r - 81 s = - 153
    18 r + 4 s = 102
    --------------------
    0 r - 85 s = - 255

    s = 255/85 = 3
    now go back and get r

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