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Algerbra 1 substitution method

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im really confused about this question:

2x-3y=21 y=3-x

using substitution method. please help

  • Algerbra 1 substitution method -

    2x - 3(3-x) = 21

    Solve for x, then y.

  • Algerbra 1 substitution method -

    2x+y=3
    x+2y=0

  • Algerbra 1 substitution method -

    X=2 Y=-1
    (2,-1)

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