I assume you mean,
8X - 5Y = 1
- 5Y = - 8X + 1
Y = (8/5)X - 5
==========
m(slope) = 8/5
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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
X=5 is a vertical line, so it has no slope. When I say it has no slope, I don't mean the slope is 0, I mean the slope is nonexistent.