algebra 1

The length of a rectangle is twice the width. The perimeter is 42cm. find the length of each side.

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  1. l=2W
    P=2L+2W=2(2W)+2W

    solve for W, and then solve for L

  2. 2(2x)+2x=42
    6x=42
    x=7
    width=7
    length=14

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