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8 May, 04:05

Solve the system of equations by substitution. x + 7y = 8 and 3/8x + 1/3y = 17/24

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Answers (2)
  1. 8 May, 04:31
    0
    Here's x and y for each equation:

    x + 7y = 8

    x = - 7y + 8

    y = - x/7 + 8/7

    3/8x + 1/3y = 17/24

    x = - 8y/9 + 17/9

    y = - 9x/8 + 17/8

    Now to plug in!

    x + 7y = 8

    -8y/9 + 17/9 + 7y = 8

    y = 1

    x + 7y = 8

    x + 7 (-9x/8 + 17/8) = 8

    x = 1
  2. 8 May, 07:09
    0
    X+7y=8

    3/8x + 1/3y = 17/24

    Multiply top equation by - 3/8

    -3/8x + 7y = 8

    3/8x + 1/3y = 17/24

    -2.625y=-3

    1/3y = 17/24

    -2.22917y = - 2916
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