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27 January, 00:33

The perimeter of a rectangle wooden deck is 90 feet. The decks length, l, is 5 feet less than 4 times it's width, w. What's the system of linear equations that can be used to determine the dimensions, in feet, of the wooden deck?

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  1. 27 January, 03:13
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    P=2 (l) + 2 (w)

    90=2 (4w-5) + 2 (w)

    90 = (8w-10) + 2w

    90=10w-10

    10+90=10w-10+10

    100=10w

    w=10

    90=2 (4[10]-5) + 2 (10)

    90=2 (40-5) + 2 (10)

    90=2 (35) + 20

    90=70+20

    90=90
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