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5 March, 01:25

The legth of a rectangle is three centimeters less than twice its width. if the perimeter of the rectangle is 18 centimeters, find its dimensions

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  1. 5 March, 02:22
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    P=2 (L+W)

    L=-3+2W

    P=18

    18=2 (L+W)

    divde 2 both sides

    9=L+W

    sub - 3+2W for L

    9=-3+2W+W

    9=-3+3W

    add 3 both sides

    12=3W

    divide both sides by 3

    4=W

    sub back

    L=-3+2W

    L=-3+2 (4)

    L=-3+8

    L=5

    it is 5cm by 4cm
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