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Finding y-intersept form two points

  1. Sep 30, 2007 #1
    1. The problem statement, all variables and given/known data
    suppose you had the points (7,1) and (3,10)

    2. Relevant equations

    i know that Y2- Y1/X2 - X1 give you the slope

    3. The attempt at a solution
    plz help this problem is killing my math grade on tests thank you
  2. jcsd
  3. Sep 30, 2007 #2


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    Ok, you have the slope. What is it? The y-intercept form is y=m*x+b where m is the slope. To find b, put one of your points into the equation, say x=7, y=1 and solve for b.
  4. Sep 30, 2007 #3


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    This part is wrong. Do you know how to correct this:
    Either use a good mathematical typesetting system, such as Tex or TexAide, or write the formula for slope properly using grouping symbols:
    (Y2 - Y1)/(X2 - X1)
  5. Sep 30, 2007 #4
    oh... thank you i feel silly now and sry bout the incorrectness i have never posted in math/science help forums before
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