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16 May, 12:38

The length is 4 units less than 3 times the width. The perimeter is 22 units more than twice the width.

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Answers (2)
  1. 16 May, 14:44
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    L = length

    w = width

    p = perimeter

    perimeter = 2L + 2W

    L = 3w-4

    p = 2w+22

    so

    2w+22 = 2 (3w-4) + 2w

    2w+22 = 6w-8+2w

    2w+22 = 8w-8

    2w+30 = 8w

    30=6w

    w = 30/6 = 5

    width = 5 units

    Length = 3w-4 = 3*5 = 15-4 = 11

    perimeter = 2w+22 = 2*5 = 10+22 = 32

    check: p = 2L + 2w = 2 (11) + 2 (5) = 22+10 = 32
  2. 16 May, 14:45
    0
    Let:l = lengthw = widthp = perimeter

    Using the information given we can formulate some equations:l = 3w - 4 [1]p = 2w + 22 [2]Because it is a rectangle:p = 2w + 2l [3]

    Using the [2] and [3], we can create another equation by setting them equal to each other, we can do this because they are both equivalent to the perimeter (p); So:2w + 22 = 2w + 2lNow, rearange and solve:2l = 22l = 11We can plug this value of l into [1] and solve for w: (11) = 3w - 43w = 15w = 5We can plug this value of w into [2] to get the perimeter:p = 2 (5) + 22 = 10 + 22 = 32

    To summarise:

    l = 11

    w = 5

    p = 32
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