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Math Help - Quadratic functions

  1. #1
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    Quadratic functions

    I got a maths test today, but I only found out this morning that we have to learn about these, too! And I don't get the second half of this example. We're learning about Quadratic functions (well, slopes and stuff), and this is what the book's example says.

    Find, in slope-intercept form, the equation of the line through (-1,3) with a slope of 5.

    Then the example goes like this :

    y - 3
    ____ = 5
    x - -1


    I.E.

    y - 3
    ______ = 5
    x + 1


    Therefore : y - 3 = 5 (x + 1)

    And now, this is the part I don't get.

    y + 3 = 5x + 5
    Last edited by ThePerfectHacker; November 14th 2007 at 05:11 PM.
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  2. #2
    Senior Member Peritus's Avatar
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    Where does that 5 come from
    5(x+1) = 5*(x+1) = 5*x + 5*1 = 5x + 5
    Last edited by ThePerfectHacker; November 14th 2007 at 05:11 PM.
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  3. #3
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    Quote Originally Posted by Peritus View Post
    5(x+1) = 5*(x+1) = 5*x + 5*1 = 5x + 5
    What does the * stand for? :O
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  4. #4
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    Quote Originally Posted by Hikaru View Post
    What does the * stand for? :O
    It stands for 'times' as in 'multiplication'.
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