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Thread: Find the value of x such that vector PR = PS.

  1. #1
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    Find the value of x such that vector PR = PS.

    Hi everyone.

    Hoping I can get some help here. I'm fairly confident with Q1 (a) and (c) but not sure how to approach question (b). Do I set it up like a normal absolute value equation with both an x and y variable or do I need to take another approach? For anyone who wants to help, I'll save you the trouble of the first step:

    PR=-3i+3j
    PS=2i

    Any help would be appreciated

    20170325_163720[1].jpg
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  2. #2
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    Re: Find the value of x such that vector PR = PS.

    Hey nalo6451.

    Hint - Set up an expression for the distance in terms of the vectors and try and solve for the unknown.

    Show your working here if you want further assistance.
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  3. #3
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    Re: Find the value of x such that vector PR = PS.

    Hey chiro, is q1 b a simpler version of q1 c or something else entirely? I know how to find the magnitude of each vector but don't really get how to 'solve for x' =/. I've attached my working for both q1 b and c below.

    Thanks.
    Attached Thumbnails Attached Thumbnails Find the value of x such that vector PR = PS.-q1_b.jpg   Find the value of x such that vector PR = PS.-q1_c.jpg  
    Last edited by nalo6451; Mar 25th 2017 at 04:57 PM.
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  4. #4
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    Re: Find the value of x such that vector PR = PS.

    Okay so I tried:

    PR+RS=PS.

    This was (-3x+3y)+(5x+3y)=2x

    Both sides simplify to zero. I've probably done something wrong here so I'm going to keep working on it, but if anyone has any tips I'm still here .
    Last edited by nalo6451; Mar 25th 2017 at 08:00 PM.
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  5. #5
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    Re: Find the value of x such that vector PR = PS.

    Sorry guys, I'm meant to make |PR| = |PS|, not PR = PS.
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