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Math Help - Can you explain this ?

  1. #1
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    Can you explain this ?

    I'm having trouble explaining this. See attachment. Can someone help ?
    Attached Thumbnails Attached Thumbnails Can you explain this ?-math.jpg  
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  2. #2
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    Quote Originally Posted by bbeam01 View Post
    I'm having trouble explaining this. See attachment. Can someone help ?
    I'll call the first rectangle 'A' and the second 'B'.

    For A, the perimeter is

    P_A=2w+2(2w+4)

    And for B:

    P_B=2(w+3)+2(3w-5)

    Do you see why that is? If so, then just plug in w=5, and see which perimeter is larger. To find out if there is a w that would make the perimeters equal, just set P_A=P_B and solve for w.
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  3. #3
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    Thanks for the quick reply. I can solve for the perimeters of both rectangles but my problem is that this comes from my fourth-graders homework and I don't think they're actually trying to solve for the value of "w" but want the theory behind why they could or couldn't be equal. Could you please explain this ?
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  4. #4
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    Sorry, I understand now. Thank You for your help and your quick response to my question.
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