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Math Help - Graphing help.

  1. #1
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    Graphing help.

    1. Find the slope of the line passing through the points (1, 1) and (2, 9).





    2. Graph 3x + 2y = 6.





    3. Find the slope and the y-intercept. y = 9x
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  2. #2
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    First off, thank you for being a MHF donor!

    Alright let's get to the math.

    1. The concept of slope is how many units are the y-values changing for every x-value. And for this we have a nice formula.

    S_line = (y2-y1)/(x2-x1)

    Does this look familiar?

    2. The form that we use to easily graph lines is: y = mx + b. So let's try to isolate y.

    3x + 2y = 6
    2y = 6 - 3x
    y = 3 - (3/2)x OR y = (-3/2)x + 3

    Can you graph it now?

    3. When a line is the form used earlier, y = mx + b, the "m" value represents the slope. Here, m = -9 and b = 0. So the slope is -9. The y-intercept occurs where x=0, so plug in 0 for x and see where this happens.

    Jameson
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