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solve the linear system using substitution
4x - y=5
4x + 4y= -4

Also by using elimination.

  • Algebra -

    substitution: since you have y = 4x-5,
    4x + 4(4x-5) = -4
    20x = 16
    x = 4/5
    y = -9/5

    using elimination, subtract one equation from the other to get

    5y = -9
    y = -9/5
    now solve for x to get x=4/5

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