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Math Help - Solving the equation of a line

  1. #1
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    Talking Solving the equation of a line

    Hi folks,

    I am having trouble trying to work out how I go about rearranging the equation I get from my graph in order to work out the value of x (at least i think that is what i need to do!) So my equation is y=3.3468x + 0.6827. I need to find out how to put 0.7545 into the equation but i dont know what i am meant to do!

    Please help!
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  2. #2
    Member mathemagister's Avatar
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    Quote Originally Posted by HowardMoon2010 View Post
    Hi folks,

    I am having trouble trying to work out how I go about rearranging the equation I get from my graph in order to work out the value of x (at least i think that is what i need to do!) So my equation is y=3.3468x + 0.6827. I need to find out how to put 0.7545 into the equation but i dont know what i am meant to do!

    Please help!
    I'm not exactly sure of what you mean, but I think you need to find the value of y when x is 0.7547.

    The point of this is to substitute (plug in) 0.7547 for x:

    y=3.3468x + 0.6827

    When you
    put 0.7545 into the equation
    you get:

    y=3.3468(0.7545) + 0.6827

    I think that concept is what you didn't understand. Do you see what it means to "put a number into an equation?" You have to substitute that number for the variable (e.g. x).
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  3. #3
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    Thanks for getting back to me.

    I thought that was what i was meant to do but it seemed too easy.

    So - y=3.3468*0.7545+0.6827=3.2078606. yeh?
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  4. #4
    Member mathemagister's Avatar
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    Quote Originally Posted by HowardMoon2010 View Post
    Thanks for getting back to me.

    I thought that was what i was meant to do but it seemed too easy.

    So - y=3.3468*0.7545+0.6827=3.2078606. yeh?
    Glad to be of help, and yes that seems to be the right answer.
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