Results 1 to 3 of 3

Math Help - Ax + By - C = 0

  1. #1
    Junior Member
    Joined
    Mar 2009
    From
    Berkeley, California
    Posts
    26

    Ax + By - C = 0

    Why does Ax + By - C = 0 ?

    Why does an equation for a line have to equal zero?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Aug 2009
    Posts
    66
    Quote Originally Posted by TheBerkeleyBoss View Post
    Why does Ax + By - C = 0 ?

    Why does an equation for a line have to equal zero?
    This is just another way of writing the equation of a line in "standard form."

    Standard form is:

    Ax + By = C

    The only thing different with your equation is that you have subtracted C from both sides.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jan 2009
    Posts
    591
    Quote Originally Posted by TheBerkeleyBoss View Post
    Why does Ax + By - C = 0 ?

    Why does an equation for a line have to equal zero?
    7x = 21

    7x - 21 = 0

    7 =  \dfrac{21}{x}

    x =  \dfrac{21}{7}

    You can write the equation in may ways, but when you have the equation equated to zero, it is called "standard form"

    Someone called it that, and others must have thought it more appropriate than "subtract all of the variables on the LHS (or RHS) from the other side and simplify" form.





    Follow Math Help Forum on Facebook and Google+


/mathhelpforum @mathhelpforum