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    momtonate's Avatar
    momtonate Posts: 2, Reputation: 1
    New Member

    May 1, 2005, 11:09 AM
    Undefined slope
    If a line has an undefined slope, what can you say about the horizontal coordinates of each of the points on the line?
    Dr_Calculus's Avatar
    Dr_Calculus Posts: 35, Reputation: 1
    Junior Member

    May 8, 2005, 02:54 PM
    an undefined slope is a vertical line, so this means that every point on the line has the same x-coordinate (horizontal coordinate)

    Dr. Calc
    reinsuranc's Avatar
    reinsuranc Posts: 92, Reputation: 6
    Junior Member

    May 8, 2005, 08:44 PM
    Undefined slope
    The above answer is correct.

    However, here is a different approach.

    Let's think about what it means to have undefined slope. For any two points on a straight line (x1,y1) and (x2,y2), the slope of the line is defined as SLOPE = (y2-y1)/(x2-x1), except that if x1=x2 then the denominator is zero and the result is undefined. This is because division by zero is not a defined operation; it's just not allowed. x1=x2 occurs on a vertical straight line. That is why the slope is undefined.

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