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Question regarding cross-linear interpolation

  1. Jul 16, 2013 #1
    This is not a homework problem.

    I am given the equation of two lines at different temperature gradients for (suction line temp,suction line pressure) => (x,y)
    At outdoor temp 95*F; y=.41667x+54.1667
    At outdoor temp 85*F; y=.4231x+50.3846

    I need to find suction line pressure for 72*F temp (72,y) at 92*F outdoor temp

    I believe the method is cross linear interpolation, how do i do this??

    Methodology needed, i can handle the calculations. This was the closest I've found to a method, but the notation is confusing and I can't get it to work: http://www.mathpages.com/home/kmath323/kmath323.htm

    please and thank you
  2. jcsd
  3. Jul 16, 2013 #2


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    Gold Member

    I believe this means interpolating the x coefficient and the constant separately to get the equation for 92°F.

    I did not check the reference.
    Last edited: Jul 16, 2013
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