algebra 1

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A rectangle has a perimeter of 12x + 20 and a width of 2x + 8. What is the length of the rectangle?

  • algebra 1 -

    let the length be l

    2l + 2(2x+8) = 12x+20
    2l = 8x + 4
    l = 4x + 2

  • algebra 1 -

    how did you get right to.... 2l= 8x + 4 ?

  • algebra 1 -

    I skipped what I thought was an easy simplification ...

    2l + 2(2x+8) = 12x+20
    2l + 4x + 16 = 12x + 20
    2l = 12x + 20 - 4x - 16
    2l = 8x + 4

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