>From a math article I was able to find, "the slope computed as m = (y2 - y1) / (x2 - x1)." If you set the left-most part of the line at (0, 0) then a lower left to upper right line has a positive slope due to the fact that both the x and y values are increasing, where an upper right to lower left line has a negative slope (y goes from 0 to -something, while x increases). I'd say that a line with a positive slope goes "upward" and a line with a negative slope goes downward.

Don't forget that 0,0 is at the top left & the x-axis increases down the screen. This makes a positive slope go from upper left to lower right. So in terms of "upwards slope" relating to to a mathematically positive slope then VfP is wrong & VB is right. In purely visual terms, I agree with you, that upwards is the otherway round. It's a poor choice of words for the documentation.