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Thread: Help with a problem involving distance and midpoint?

  1. #1
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    Help with a problem involving distance and midpoint?

    Hello everyone. I tried solving this problem (attached photo) and arrived at the answer k=4 for number 1. I tried solving number 2 but I just don't get how to do it. Any help would be very much appreciated. Thanks a bunch!
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  2. #2
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    Re: Help with a problem involving distance and midpoint?

    You want $|y|=|x|+1$ and you are given the point $(1,k)$. So, plugging in, you have

    $$|k|=|1|+1$$

    This gives $|k|=2$ and $k=\pm 2$.
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  3. #3
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    Re: Help with a problem involving distance and midpoint?

    Point D is (0, 2) and point Y is (2, -2). The midpoint of interval DY is ((0+ 2)/2, (2- 2)/2)= (1, 0). A is the point (1, k). The square of the distance between A and (1, 0) is $\displaystyle (1- 1)^2+ (k- 0)^2= k^2= 4^2= 16$. What are the solutions to $\displaystyle k^2= 16$?
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  4. #4
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    Re: Help with a problem involving distance and midpoint?

    Quote Originally Posted by HallsofIvy View Post
    Point D is (0, 2) and point Y is (2, -2). The midpoint of interval DY is ((0+ 2)/2, (2- 2)/2)= (1, 0). A is the point (1, k). The square of the distance between A and (1, 0) is $\displaystyle (1- 1)^2+ (k- 0)^2= k^2= 4^2= 16$. What are the solutions to $\displaystyle k^2= 16$?
    The OP said that he/she solved that problem. He/she even stated the answer of $\pm 4$.
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