intersection?

Discussion in 'Math' started by ihaveaquestion, Sep 7, 2009.

  1. ihaveaquestion

    Thread Starter Active Member

    May 1, 2009
    314
    0
    y = sqrt(x)
    y = x - 6

    I'm getting that they intersect at (4, 2) and (9, 3), but when you look on a grapher it doesn't look like it... especially (4,2).... plus it doesn't make sense for them to intersect twice when you think about it...
     
  2. Ratch

    New Member

    Mar 20, 2007
    1,068
    3
    ihaveaquestion,

    I get (9,3) and (4,-2) . You introduced another solution when you squared the top equation to get y^2=x . So the (4,-2) solution is rejected because sqrt(4) does not equal -2 .

    Ratch
     
  3. ihaveaquestion

    Thread Starter Active Member

    May 1, 2009
    314
    0
    i see, got it
     
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