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Math Help - Celcius Conversion

  1. #1
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    Celcius Conversion

    I know there is a simple way to solve this question, but I can't figure out how to set up the next step of the problem.

    If Fareinheit temperature is 85, and the formula for Celsius conversion is 9/5C+32, what is the Celsius temperature?
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  2. #2
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    Re: Celcius Conversion

    The Celsius to Fahrenheit conversion is F = (9/5) C + 32. To go the other way, you must invert this linear function. How do you do that?
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  3. #3
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    Re: Celcius Conversion

    Quote Originally Posted by Ackbeet View Post
    The Celsius to Fahrenheit conversion is F = (9/5) C + 32. To go the other way, you must invert this linear function. How do you do that?
    Correct me if I'm wrong. (I get these questions from strictly timed practice tests. So to meet the time requirement, I don't have time to solve the problem in detail, and review and memorize rules later)

    C= F(5/9)-32?
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    Re: Celcius Conversion

    That's incorrect. To invert, you must switch the roles of F and C, and then solve for C. What do you get?
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  5. #5
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    Re: Celcius Conversion

    No. You must perform subtraction before dividing because of the order of operations
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  6. #6
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    Re: Celcius Conversion

    Quote Originally Posted by Ackbeet View Post
    That's incorrect. To invert, you must switch the roles of F and C, and then solve for C. What do you get?
    I looked up the formula, and I am finding 2 conflicting equations. I see C= (5/9)F-32, and C=(5/9) * (F-32)

    I am more confused now than I was before.
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    Re: Celcius Conversion

    The second equation is correct, the first is not. See here. From the original formula, as e^(i*pi) said, you must first subtract the 32, and then multiply by 5/9.
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  8. #8
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    Re: Celcius Conversion

    F= 1.8 c +32
    f -32/1.8 =c
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  9. #9
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    Re: Celcius Conversion

    Ah I see now. Thank you all very much for your help.
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  10. #10
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    Re: Celcius Conversion

    If Fareinheit temperature is 85, and the formula for Celsius conversion is 9/5C+32, what is the Celsius temperature?
    Instead of solving for the general "inverse" you could just solve the equation
    85= (9/5)C+ 32 for C.
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  11. #11
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    Re: Celcius Conversion

    Quote Originally Posted by KingNathan View Post
    I looked up the formula, and I am finding 2 conflicting equations. I see C= (5/9)F-32, and C=(5/9) * (F-32)

    I am more confused now than I was before.
    When in doubt, CHECK!

    -40C = -40F

    0C = 32F

    40C = 104F

    100C = 212F

    Memorize these four.

    You may also want 37C = 98.6F
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  12. #12
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    Re: Celcius Conversion

    Quote Originally Posted by TKHunny View Post
    When in doubt, CHECK!

    -40C = -40F

    0C = 32F

    40C = 104F

    100C = 212F

    Memorize these four.

    You may also want 37C = 98.6F
    Excellent advice. Excellent.
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