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math

posted by on .

x-5y=-21
9y-8x=44
substitution method

  • math - ,

    x-5y=-21
    9y-8x=44

    x = 5y - 21

    9y - 8(5y - 21) = 44
    9y - 40y + 168 = 44
    -31y = 44 - 168
    -31y = -124
    y = 4

    Take it from there.

  • math - ,

    x = 5y -21

    9y-8(5y-21) = 44

    9y -40y +168 = 44

    -31y + 168 = 44

    -31y + 168 -168 = 44 -168

    -31y = -124

    y = 4

    x = 5(4)-21 = -1

    (-1, 4)

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