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8 July, 23:28

Substitution 4x+6y=32. x=2y+16

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Answers (2)
  1. 8 July, 23:43
    0
    4x + 6y = 32

    x = 2y + 16

    4 (2y + 16) + 6y = 32

    8y + 64 + 6y = 32

    8y + 6y = 32 - 64

    14y = - 32

    y = - 32/14 ... reduces to - 16/7

    x = 2y + 16

    x = 2 (-16/7) + 16

    x = - 32/7 + 16

    x = - 32/7 + 112/7

    x = 80/7

    solution is (80/7, - 16/7)
  2. 8 July, 23:44
    0
    4 (2y+16) + 6y=32

    14y+16+=32

    y=1.14

    x=18.28
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