algebra

The length of a rectangle is 3 times less 5 the width. If the perimeter is 150 cm, what are the dimensions of the rectangle?

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  1. 3 w - 5 = L
    w + L = 75 so L = (75-w)

    3 w - 5 = 75 - w
    4 w = 80
    w = 20
    L = 75 - 20 = 55

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  2. 2W+2L = 150
    2W+2(3W-5) = 150
    W = 20 cm.
    L = 3W-5 = 60-5 = 55 cm.

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