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Geometry homework problem help

  1. May 22, 2009 #1
    1. The problem statement, all variables and given/known data
    Point M is the midpoint of RT ( with the lin on top of RT).RM = x and RT = 4x-6. Find the value of x.


    2. Relevant equations



    3. The attempt at a solution
    I wrote out the equation (RT=4x-6)/2=RM but I am not sure if this is the right approach.
     
  2. jcsd
  3. May 22, 2009 #2
    Re: Geometry

    A little help would be greatly appreciated.
     
  4. May 22, 2009 #3

    symbolipoint

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    Re: Geometry

    Your approach seems good. Continue!

    You have an expression for the full length measure and you have an expression for half of that full length measure. You only have one variable.
     
  5. May 23, 2009 #4
    Re: Geometry

    What should I do though? Do I have to isolate the x? I have two variables thought RT and x.
     
    Last edited: May 23, 2009
  6. May 23, 2009 #5
    Re: Geometry

    You know that RT= 4x-6.

    You should be able to get an equation with one variable.
     
  7. May 23, 2009 #6
    Re: Geometry

    And since RM = x, the equation would simply be
    [tex]\frac{4x - 6}{2} = x[/tex]
    so yes, there is just one variable.


    01
     
  8. May 25, 2009 #7

    chiro

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    Re: Geometry

    You basically said the answer. Equality is commutative.

    if x = RM then RM = x for all R,M,x
     
  9. May 25, 2009 #8

    symbolipoint

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    Re: Geometry

    You more correctly mean to say, equality is "symmetric".
     
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