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16 February, 12:26

2x+8y=74

3x - 4y = 43

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Answers (2)
  1. 16 February, 12:39
    0
    (2x+8y) / 2=74/2

    x+4y=37

    x=37-4y

    3 (37-4y) - 4y=43

    117 - 12y - 4y = 43

    -16y = 74

    y=4.625

    x=37 - 4 (4.625)

    x = 37 - 18.5

    x = 55.5

    so y=4.625,x=55.5
  2. 16 February, 16:20
    0
    y=17/7

    x=123/7

    Explanation:

    2x=74-8y

    x = (74-8y) / 2

    x=2 (37-8y) / 2

    x=37-8y

    3 (37-8y) - 4y=43

    111-24y-4y=43

    111-43=24y+4y

    68=28y

    y=68/28

    y=17/7

    x=37-8 (17/7)

    x=37-136/7 = (37*7-136) / 7 = (259-136) / 7

    x=123/7
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