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Math Help - solving for two unknowns?

  1. #1
    Newbie
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    solving for two unknowns?

    Hello there need a bit of help in solving an equation to find two unknowns. the equation is


    P_o = \left( \frac{K_c y}{A x}\right)I_{in} + \frac{F_s z}{Ax}

    i need to find the values for x and y what i cant work out is how to isolate them and how to find 2 unknowns.

    A= 5cm^2
    Z= 75mm
    x+y = 100mm
    Kc= 2500 Newtons per Ampere
    Po is in bar and is 0.2 at 4mA
    Iin is in mA and is 4 at 0.2Bar
    all units must be in SI

    any help greatly appreciated. Thanks ian
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  2. #2
    Senior Member
    Joined
    Dec 2010
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    x + y = 100mm
    So y = 100mm - x

    Substitue this for y.
    Solve for x.
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  3. #3
    Member rtblue's Avatar
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    Mar 2009
    From
    Birmingham, Alabama.
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    221
    Are you given what F_s is?

    If so:

    x+y=100
    x=100-y

    substitute this in for x, and solve for y.

    If you're not given what F_s is, then you actually have 3 unknowns, with 2 equations and you cannot solve for x or y.
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  4. #4
    Newbie
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    May 2009
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    thank you for the replies and help
    i can see what i need to do
    i have been transforming that equation all week but im obviously not doing it right i need to speak to my tutor im miising basic maths here

    thanks again
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