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Point-slope form is just another way to express a linear equation. It uses two (any two points that fall on the line) and the slope of the line (Therefore the name point-slope form).y2 - y1 = m(x2 - x1)...with m as the slope.
then the slope is x=y. there is no slope.
Examples of slope: http://www.answers.com/topic/slope http://en.wikipedia.org/wiki/Slope
Yes, it is true; slope zero is no slope.
m = slope