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    Lief_of_Del's Avatar
    Lief_of_Del Posts: 57, Reputation: 4
    Junior Member
    		  
    #1

    Feb 11, 2008, 11:03 PM
    no y intercept, slope undefined
    I'm having trouble helping someone with there homework

    queation: find the equation of the line that has no y intercept, has an x intercept of 4, and who's slope is undefined

    y+mx+b
    since b is y intercept and there is none that is 0 and disappears so next I used the points (4,0) to plug into formula

    0=m4
    0/4=m

    that is not possible so what would be the equation of the line
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
    Uber Member
    		  
    #2

    Feb 12, 2008, 01:44 AM
    :-)

    You don't need that equation. It's a straight verticle line at x = 4.

    Think about it. If it's a "line" (linear) and has no y intercept, it can't tilt either direction or it will eventually run across the y line. So it has to be verticle. And where? At x = 4.

    Change in y over change in x: there's no change in x, putting a zero in the denominator. Undefined.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
    		  
    #3

    Feb 12, 2008, 05:12 AM
    'vertical'.
    jaganadsfad's Avatar
    jaganadsfad Posts: 1, Reputation: 1
    New Member
    		  
    #4

    Jan 13, 2011, 05:42 PM
    Great answer. Checkout They have a detail explanation of slope

    http://www.thexorb.com/Algebra/Slope/Slope-Calculation.aspx
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